pic_i8259.c revision 1.1.2.2
1 /* $NetBSD: pic_i8259.c,v 1.1.2.2 2007/05/04 10:03:28 nisimura 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: pic_i8259.c,v 1.1.2.2 2007/05/04 10:03:28 nisimura 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 i8259_initialize(void); 57 static void i8259_enable_irq(struct pic_ops *, int, int); 58 static void i8259_disable_irq(struct pic_ops *, int); 59 static int i8259_get_irq(struct pic_ops *); 60 static void i8259_ack_irq(struct pic_ops *, int); 61 62 struct i8259_ops { 63 struct pic_ops pic; 64 uint32_t pending_events; 65 uint32_t enable_mask; 66 uint32_t irqs; 67 }; 68 69 struct pic_ops * 70 setup_i8259(void) 71 { 72 struct i8259_ops *i8259; 73 struct pic_ops *pic; 74 75 i8259 = malloc(sizeof(struct i8259_ops), M_DEVBUF, M_NOWAIT); 76 KASSERT(i8259 != NULL); 77 pic = &i8259->pic; 78 79 pic->pic_numintrs = 16; 80 pic->pic_cookie = (void *)NULL; 81 pic->pic_enable_irq = i8259_enable_irq; 82 pic->pic_reenable_irq = i8259_enable_irq; 83 pic->pic_disable_irq = i8259_disable_irq; 84 pic->pic_get_irq = i8259_get_irq; 85 pic->pic_ack_irq = i8259_ack_irq; 86 pic->pic_establish_irq = dummy_pic_establish_intr; 87 strcpy(pic->pic_name, "i8259"); 88 pic_add(pic); 89 i8259->pending_events = 0; 90 i8259->enable_mask = 0xffffffff; 91 i8259->irqs = 0; 92 93 i8259_initialize(); 94 95 return pic; 96 } 97 98 void 99 i8259_initialize(void) 100 { 101 isa_outb(IO_ICU1, 0x11); /* program device, four bytes */ 102 isa_outb(IO_ICU1+1, 0); /* starting at this vector */ 103 isa_outb(IO_ICU1+1, 1 << IRQ_SLAVE); /* slave on line 2 */ 104 isa_outb(IO_ICU1+1, 1); /* 8086 mode */ 105 isa_outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 106 107 isa_outb(IO_ICU2, 0x11); /* program device, four bytes */ 108 isa_outb(IO_ICU2+1, 8); /* starting at this vector */ 109 isa_outb(IO_ICU2+1, IRQ_SLAVE); 110 isa_outb(IO_ICU2+1, 1); /* 8086 mode */ 111 isa_outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 112 } 113 114 static void 115 i8259_enable_irq(struct pic_ops *pic, int irq, int type) 116 { 117 struct i8259_ops *i8259 = (struct i8259_ops *)pic; 118 119 i8259->irqs |= 1 << irq; 120 if (i8259->irqs >= 0x100) /* IRQS >= 8 in use? */ 121 i8259->irqs |= 1 << IRQ_SLAVE; 122 123 i8259->enable_mask = ~i8259->irqs; 124 isa_outb(IO_ICU1+1, i8259->enable_mask); 125 isa_outb(IO_ICU2+1, i8259->enable_mask >> 8); 126 } 127 128 static void 129 i8259_disable_irq(struct pic_ops *pic, int irq) 130 { 131 struct i8259_ops *i8259 = (struct i8259_ops *)pic; 132 uint32_t mask = 1 << irq; 133 134 i8259->enable_mask |= mask; 135 isa_outb(IO_ICU1+1, i8259->enable_mask); 136 isa_outb(IO_ICU2+1, i8259->enable_mask >> 8); 137 } 138 139 static int 140 i8259_get_irq(struct pic_ops *pic) 141 { 142 int irq; 143 144 isa_outb(IO_ICU1, 0x0c); 145 irq = isa_inb(IO_ICU1) & 0x07; 146 if (irq == IRQ_SLAVE) { 147 isa_outb(IO_ICU2, 0x0c); 148 irq = (isa_inb(IO_ICU2) & 0x07) + 8; 149 } 150 151 if (irq == 0) 152 return 255; 153 154 return irq; 155 } 156 157 static void 158 i8259_ack_irq(struct pic_ops *pic, int irq) 159 { 160 if (irq < 8) { 161 isa_outb(IO_ICU1, 0xe0 | irq); 162 } else { 163 isa_outb(IO_ICU2, 0xe0 | (irq & 7)); 164 isa_outb(IO_ICU1, 0xe0 | IRQ_SLAVE); 165 } 166 } 167
Indexes created Fri Oct 31 11:10:07 GMT 2025