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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4377 | svoboda | 1 | /* |
| 2 | * Copyright (c) 2009 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 | |||
| 29 | /** @addtogroup genarch |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** |
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| 33 | * @file |
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| 34 | * @brief i8042 processor driver |
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| 35 | * |
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| 36 | * It takes care of the i8042 serial communication. |
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| 37 | * |
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| 38 | */ |
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| 39 | |||
| 40 | #include <genarch/drivers/i8042/i8042.h> |
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| 41 | #include <genarch/drivers/legacy/ia32/io.h> |
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| 42 | #include <arch/asm.h> |
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| 43 | #include <console/chardev.h> |
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| 44 | #include <mm/slab.h> |
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| 45 | #include <ddi/device.h> |
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| 46 | |||
| 47 | #define i8042_SET_COMMAND 0x60 |
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| 48 | #define i8042_COMMAND 0x69 |
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| 49 | #define i8042_CPU_RESET 0xfe |
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| 50 | |||
| 51 | #define i8042_BUFFER_FULL_MASK 0x01 |
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| 52 | #define i8042_WAIT_MASK 0x02 |
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| 53 | |||
| 54 | static irq_ownership_t i8042_claim(irq_t *irq) |
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| 55 | { |
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| 56 | i8042_instance_t *i8042_instance = irq->instance; |
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| 57 | i8042_t *dev = i8042_instance->i8042; |
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| 58 | |||
| 59 | if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK) |
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| 60 | return IRQ_ACCEPT; |
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| 61 | else |
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| 62 | return IRQ_DECLINE; |
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| 63 | } |
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| 64 | |||
| 65 | static void i8042_irq_handler(irq_t *irq) |
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| 66 | { |
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| 67 | i8042_instance_t *instance = irq->instance; |
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| 68 | i8042_t *dev = instance->i8042; |
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| 69 | uint8_t status; |
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| 70 | |||
| 71 | if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) { |
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| 72 | uint8_t data = pio_read_8(&dev->data); |
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| 73 | indev_push_character(instance->kbrdin, data); |
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| 74 | } |
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| 75 | } |
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| 76 | |||
| 77 | /**< Clear input buffer. */ |
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| 78 | static void i8042_clear_buffer(i8042_t *dev) |
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| 79 | { |
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| 80 | while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK) |
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| 81 | (void) pio_read_8(&dev->data); |
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| 82 | } |
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| 83 | |||
| 84 | /** Initialize i8042. */ |
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| 85 | i8042_instance_t *i8042_init(i8042_t *dev, inr_t inr) |
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| 86 | { |
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| 87 | i8042_instance_t *instance |
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| 88 | = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC); |
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| 89 | if (instance) { |
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| 90 | instance->i8042 = dev; |
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| 91 | instance->kbrdin = NULL; |
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| 92 | |||
| 93 | irq_initialize(&instance->irq); |
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| 94 | instance->irq.devno = device_assign_devno(); |
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| 95 | instance->irq.inr = inr; |
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| 96 | instance->irq.claim = i8042_claim; |
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| 97 | instance->irq.handler = i8042_irq_handler; |
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| 98 | instance->irq.instance = instance; |
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| 99 | |||
| 100 | } |
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| 101 | |||
| 102 | return instance; |
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| 103 | } |
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| 104 | |||
| 105 | void i8042_wire(i8042_instance_t *instance, indev_t *kbrdin) |
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| 106 | { |
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| 107 | ASSERT(instance); |
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| 108 | ASSERT(kbrdin); |
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| 109 | |||
| 110 | instance->kbrdin = kbrdin; |
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| 111 | irq_register(&instance->irq); |
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| 112 | i8042_clear_buffer(instance->i8042); |
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| 113 | } |
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| 114 | |||
| 115 | /* Reset CPU by pulsing pin 0 */ |
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| 116 | void i8042_cpu_reset(i8042_t *dev) |
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| 117 | { |
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| 118 | interrupts_disable(); |
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| 119 | |||
| 120 | i8042_clear_buffer(dev); |
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| 121 | |||
| 122 | /* Reset CPU */ |
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| 123 | pio_write_8(&dev->status, i8042_CPU_RESET); |
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| 124 | } |
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| 125 | |||
| 126 | /** @} |
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| 127 | */ |