pic_i8259.c revision 1.1.2.1
1 /* $NetBSD: pic_i8259.c,v 1.1.2.1 2007/05/04 00:57:24 garbled 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 1.1.2.1 2007/05/04 00:57:24 garbled 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 int i8259_irq_is_enabled(struct pic_ops *, int); 58 static void i8259_enable_irq(struct pic_ops *, int, int); 59 static void i8259_disable_irq(struct pic_ops *, int); 60 static void i8259_clear_irq(struct pic_ops *, int); 61 static int i8259_get_irq(struct pic_ops *); 62 static void i8259_ack_irq(struct pic_ops *, int); 63 64 struct i8259_ops { 65 struct pic_ops pic; 66 uint32_t pending_events; 67 uint32_t enable_mask; 68 uint32_t irqs; 69 }; 70 71 struct pic_ops * 72 setup_i8259(void) 73 { 74 struct i8259_ops *i8259; 75 struct pic_ops *pic; 76 77 i8259 = malloc(sizeof(struct i8259_ops), M_DEVBUF, M_NOWAIT); 78 KASSERT(i8259 != NULL); 79 pic = &i8259->pic; 80 81 pic->pic_numintrs = 16; 82 pic->pic_cookie = (void *)NULL; 83 pic->pic_irq_is_enabled = i8259_irq_is_enabled; 84 pic->pic_enable_irq = i8259_enable_irq; 85 pic->pic_reenable_irq = i8259_enable_irq; 86 pic->pic_disable_irq = i8259_disable_irq; 87 pic->pic_clear_irq = i8259_clear_irq; 88 pic->pic_get_irq = i8259_get_irq; 89 pic->pic_ack_irq = i8259_ack_irq; 90 pic->pic_establish_irq = dummy_pic_establish_intr; 91 strcpy(pic->pic_name, "i8259"); 92 pic_add(pic); 93 i8259->pending_events = 0; 94 i8259->enable_mask = 0xffffffff; 95 i8259->irqs = 0; 96 97 i8259_initialize(); 98 99 return pic; 100 } 101 102 void 103 i8259_initialize(void) 104 { 105 isa_outb(IO_ICU1, 0x11); /* program device, four bytes */ 106 isa_outb(IO_ICU1+1, 0); /* starting at this vector */ 107 isa_outb(IO_ICU1+1, 1 << IRQ_SLAVE); /* slave on line 2 */ 108 isa_outb(IO_ICU1+1, 1); /* 8086 mode */ 109 isa_outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 110 111 isa_outb(IO_ICU2, 0x11); /* program device, four bytes */ 112 isa_outb(IO_ICU2+1, 8); /* starting at this vector */ 113 isa_outb(IO_ICU2+1, IRQ_SLAVE); 114 isa_outb(IO_ICU2+1, 1); /* 8086 mode */ 115 isa_outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 116 } 117 118 static int 119 i8259_irq_is_enabled(struct pic_ops *pic, int irq) 120 { 121 return 1; 122 } 123 124 static void 125 i8259_enable_irq(struct pic_ops *pic, int irq, int type) 126 { 127 struct i8259_ops *i8259 = (struct i8259_ops *)pic; 128 129 i8259->irqs |= 1 << irq; 130 if (i8259->irqs >= 0x100) /* IRQS >= 8 in use? */ 131 i8259->irqs |= 1 << IRQ_SLAVE; 132 133 i8259->enable_mask = ~i8259->irqs; 134 isa_outb(IO_ICU1+1, i8259->enable_mask); 135 isa_outb(IO_ICU2+1, i8259->enable_mask >> 8); 136 } 137 138 static void 139 i8259_disable_irq(struct pic_ops *pic, int irq) 140 { 141 struct i8259_ops *i8259 = (struct i8259_ops *)pic; 142 uint32_t mask = 1 << irq; 143 144 i8259->enable_mask |= mask; 145 isa_outb(IO_ICU1+1, i8259->enable_mask); 146 isa_outb(IO_ICU2+1, i8259->enable_mask >> 8); 147 } 148 149 static void 150 i8259_clear_irq(struct pic_ops *pic, int irq) 151 { 152 /* do nothing */ 153 } 154 155 static int 156 i8259_get_irq(struct pic_ops *pic) 157 { 158 int irq; 159 160 isa_outb(IO_ICU1, 0x0c); 161 irq = isa_inb(IO_ICU1) & 0x07; 162 if (irq == IRQ_SLAVE) { 163 isa_outb(IO_ICU2, 0x0c); 164 irq = (isa_inb(IO_ICU2) & 0x07) + 8; 165 } 166 167 if (irq == 0) 168 return 255; 169 170 return irq; 171 } 172 173 static void 174 i8259_ack_irq(struct pic_ops *pic, int irq) 175 { 176 if (irq < 8) { 177 isa_outb(IO_ICU1, 0xe0 | irq); 178 } else { 179 isa_outb(IO_ICU2, 0xe0 | (irq & 7)); 180 isa_outb(IO_ICU1, 0xe0 | IRQ_SLAVE); 181 } 182 } 183
Indexes created Mon Oct 27 04:09:48 GMT 2025