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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1754 | jermar | 29 | /** @addtogroup ia32 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 1754 | jermar | 32 | /** |
| 33 | * @file |
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| 34 | * @brief PIC driver. |
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| 35 | * |
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| 36 | * Programmable Interrupt Controller for UP systems based on i8259 chip. |
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| 1702 | cejka | 37 | */ |
| 38 | |||
| 1477 | decky | 39 | #include <arch/drivers/i8259.h> |
| 1 | jermar | 40 | #include <cpu.h> |
| 41 | #include <arch/types.h> |
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| 42 | #include <arch/asm.h> |
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| 43 | #include <arch.h> |
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| 195 | vana | 44 | #include <print.h> |
| 576 | palkovsky | 45 | #include <interrupt.h> |
| 1 | jermar | 46 | |
| 958 | jermar | 47 | static void pic_spurious(int n, istate_t *istate); |
| 576 | palkovsky | 48 | |
| 1 | jermar | 49 | void i8259_init(void) |
| 50 | { |
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| 51 | /* ICW1: this is ICW1, ICW4 to follow */ |
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| 52 | outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4); |
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| 53 | |||
| 54 | /* ICW2: IRQ 0 maps to INT IRQBASE */ |
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| 55 | outb(PIC_PIC0PORT2, IVT_IRQBASE); |
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| 125 | jermar | 56 | |
| 1 | jermar | 57 | /* ICW3: pic1 using IRQ IRQ_PIC1 */ |
| 58 | outb(PIC_PIC0PORT2, 1 << IRQ_PIC1); |
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| 125 | jermar | 59 | |
| 60 | /* ICW4: i8086 mode */ |
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| 1 | jermar | 61 | outb(PIC_PIC0PORT2, 1); |
| 62 | |||
| 63 | /* ICW1: ICW1, ICW4 to follow */ |
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| 64 | outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4); |
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| 65 | |||
| 125 | jermar | 66 | /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */ |
| 1 | jermar | 67 | outb(PIC_PIC1PORT2, IVT_IRQBASE + 8); |
| 68 | |||
| 305 | jermar | 69 | /* ICW3: pic1 is known as IRQ_PIC1 */ |
| 302 | palkovsky | 70 | outb(PIC_PIC1PORT2, IRQ_PIC1); |
| 1 | jermar | 71 | |
| 125 | jermar | 72 | /* ICW4: i8086 mode */ |
| 1 | jermar | 73 | outb(PIC_PIC1PORT2, 1); |
| 74 | |||
| 75 | /* |
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| 76 | * Register interrupt handler for the PIC spurious interrupt. |
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| 77 | */ |
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| 958 | jermar | 78 | exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious); |
| 1 | jermar | 79 | |
| 80 | /* |
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| 81 | * Set the enable/disable IRQs handlers. |
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| 82 | * Set the End-of-Interrupt handler. |
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| 83 | */ |
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| 84 | enable_irqs_function = pic_enable_irqs; |
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| 85 | disable_irqs_function = pic_disable_irqs; |
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| 86 | eoi_function = pic_eoi; |
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| 125 | jermar | 87 | |
| 1 | jermar | 88 | pic_disable_irqs(0xffff); /* disable all irq's */ |
| 89 | pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */ |
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| 90 | } |
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| 91 | |||
| 92 | void pic_enable_irqs(__u16 irqmask) |
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| 93 | { |
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| 94 | __u8 x; |
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| 125 | jermar | 95 | |
| 1 | jermar | 96 | if (irqmask & 0xff) { |
| 125 | jermar | 97 | x = inb(PIC_PIC0PORT2); |
| 1 | jermar | 98 | outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff))); |
| 99 | } |
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| 100 | if (irqmask >> 8) { |
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| 125 | jermar | 101 | x = inb(PIC_PIC1PORT2); |
| 1 | jermar | 102 | outb(PIC_PIC1PORT2, x & (~(irqmask >> 8))); |
| 103 | } |
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| 104 | } |
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| 105 | |||
| 106 | void pic_disable_irqs(__u16 irqmask) |
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| 107 | { |
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| 108 | __u8 x; |
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| 125 | jermar | 109 | |
| 1 | jermar | 110 | if (irqmask & 0xff) { |
| 125 | jermar | 111 | x = inb(PIC_PIC0PORT2); |
| 1 | jermar | 112 | outb(PIC_PIC0PORT2, x | (irqmask & 0xff)); |
| 113 | } |
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| 114 | if (irqmask >> 8) { |
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| 125 | jermar | 115 | x = inb(PIC_PIC1PORT2); |
| 1 | jermar | 116 | outb(PIC_PIC1PORT2, x | (irqmask >> 8)); |
| 117 | } |
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| 118 | } |
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| 119 | |||
| 120 | void pic_eoi(void) |
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| 121 | { |
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| 122 | outb(0x20,0x20); |
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| 125 | jermar | 123 | outb(0xa0,0x20); |
| 1 | jermar | 124 | } |
| 125 | |||
| 958 | jermar | 126 | void pic_spurious(int n, istate_t *istate) |
| 1 | jermar | 127 | { |
| 1667 | jermar | 128 | #ifdef CONFIG_DEBUG |
| 15 | jermar | 129 | printf("cpu%d: PIC spurious interrupt\n", CPU->id); |
| 1667 | jermar | 130 | #endif |
| 1 | jermar | 131 | } |
| 1702 | cejka | 132 | |
| 1754 | jermar | 133 | /** @} |
| 1702 | cejka | 134 | */ |