1/* $NetBSD: i8259_common.c,v 1.6 2011/06/20 06:21:45 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 1.6 2011/06/20 06:21:45 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 48void 49i8259_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 64void 65i8259_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 78void 79i8259_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 89void 90i8259_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 100int 101i8259_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