120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/* $NetBSD: i8259_common.c,v 1.4 2008/04/28 20:23:32 martin Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Tim Rightnour
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: i8259_common.c,v 1.4 2008/04/28 20:23:32 martin Exp $");
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <uvm/uvm_extern.h>
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#include <machine/pio.h>
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#include <machine/intr.h>
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#include <arch/powerpc/pic/picvar.h>
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#include <dev/isa/isareg.h>
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#include <dev/isa/isavar.h>
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void
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i8259_initialize(void)
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{
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isa_outb(IO_ICU1, 0x11); /* program device, four bytes */
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isa_outb(IO_ICU1+1, 0); /* starting at this vector */
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isa_outb(IO_ICU1+1, 1 << IRQ_SLAVE); /* slave on line 2 */
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isa_outb(IO_ICU1+1, 1); /* 8086 mode */
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isa_outb(IO_ICU1+1, 0xff); /* leave interrupts masked */
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isa_outb(IO_ICU2, 0x11); /* program device, four bytes */
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isa_outb(IO_ICU2+1, 8); /* starting at this vector */
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isa_outb(IO_ICU2+1, IRQ_SLAVE);
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isa_outb(IO_ICU2+1, 1); /* 8086 mode */
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isa_outb(IO_ICU2+1, 0xff); /* leave interrupts masked */
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}
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void
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i8259_enable_irq(struct pic_ops *pic, int irq, int type)
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{
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struct i8259_ops *i8259 = (struct i8259_ops *)pic;
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i8259->irqs |= 1 << irq;
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if (i8259->irqs >= 0x100) /* IRQS >= 8 in use? */
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i8259->irqs |= 1 << IRQ_SLAVE;
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i8259->enable_mask = ~i8259->irqs;
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isa_outb(IO_ICU1+1, i8259->enable_mask);
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isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
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}
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void
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i8259_disable_irq(struct pic_ops *pic, int irq)
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{
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struct i8259_ops *i8259 = (struct i8259_ops *)pic;
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uint32_t mask = 1 << irq;
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i8259->enable_mask |= mask;
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isa_outb(IO_ICU1+1, i8259->enable_mask);
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isa_outb(IO_ICU2+1, i8259->enable_mask >> 8);
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}
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void
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i8259_ack_irq(struct pic_ops *pic, int irq)
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{
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if (irq < 8) {
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isa_outb(IO_ICU1, 0xe0 | irq);
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} else {
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isa_outb(IO_ICU2, 0xe0 | (irq & 7));
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isa_outb(IO_ICU1, 0xe0 | IRQ_SLAVE);
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}
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}
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int
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i8259_get_irq(struct pic_ops *pic, int mode)
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{
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int irq;
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isa_outb(IO_ICU1, 0x0c);
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irq = isa_inb(IO_ICU1) & 0x07;
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if (irq == IRQ_SLAVE) {
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isa_outb(IO_ICU2, 0x0c);
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irq = (isa_inb(IO_ICU2) & 0x07) + 8;
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}
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if (irq == 0 && mode == PIC_GET_IRQ)
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return 255;
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if (irq == 7 && mode == PIC_GET_RECHECK)
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return 255;
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return irq;
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}
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