Subversion Repositories HelenOS

Rev

Rev 4223 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
3982 jermar 2
 * Copyright (c) 2009 Jakub Jermar
1 jermar 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
4094 decky 29
/** @addtogroup genarch
1702 cejka 30
 * @{
31
 */
1754 jermar 32
/**
1757 jermar 33
 * @file
4094 decky 34
 * @brief i8042 processor driver
1754 jermar 35
 *
4042 jermar 36
 * It takes care of the i8042 serial communication.
4223 decky 37
 *
1702 cejka 38
 */
39
 
4042 jermar 40
#include <genarch/drivers/i8042/i8042.h>
3932 jermar 41
#include <genarch/drivers/legacy/ia32/io.h>
1 jermar 42
#include <arch/asm.h>
511 jermar 43
#include <console/chardev.h>
4042 jermar 44
#include <mm/slab.h>
4148 decky 45
#include <ddi/device.h>
1 jermar 46
 
4119 decky 47
static indev_operations_t kbrdin_ops = {
4094 decky 48
    .poll = NULL
49
};
894 jermar 50
 
4094 decky 51
#define i8042_SET_COMMAND  0x60
52
#define i8042_COMMAND      0x69
4251 decky 53
#define i8042_CPU_RESET    0xfe
670 vana 54
 
4094 decky 55
#define i8042_BUFFER_FULL_MASK  0x01
56
#define i8042_WAIT_MASK         0x02
57
 
3941 jermar 58
static irq_ownership_t i8042_claim(irq_t *irq)
1474 palkovsky 59
{
3941 jermar 60
    i8042_instance_t *i8042_instance = irq->instance;
3931 jermar 61
    i8042_t *dev = i8042_instance->i8042;
4094 decky 62
 
3931 jermar 63
    if (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
64
        return IRQ_ACCEPT;
65
    else
66
        return IRQ_DECLINE;
1956 decky 67
}
1474 palkovsky 68
 
3906 jermar 69
static void i8042_irq_handler(irq_t *irq)
1956 decky 70
{
3931 jermar 71
    i8042_instance_t *instance = irq->instance;
72
    i8042_t *dev = instance->i8042;
73
    uint8_t status;
4094 decky 74
 
3931 jermar 75
    if (((status = pio_read_8(&dev->status)) & i8042_BUFFER_FULL_MASK)) {
4094 decky 76
        uint8_t data = pio_read_8(&dev->data);
77
        indev_push_character(&instance->kbrdin, data);
1956 decky 78
    }
79
}
1474 palkovsky 80
 
1956 decky 81
/** Initialize i8042. */
4148 decky 82
indev_t *i8042_init(i8042_t *dev, inr_t inr)
1956 decky 83
{
4094 decky 84
    i8042_instance_t *instance
85
        = malloc(sizeof(i8042_instance_t), FRAME_ATOMIC);
3963 jermar 86
    if (!instance)
4094 decky 87
        return NULL;
1956 decky 88
 
4094 decky 89
    indev_initialize("i8042", &instance->kbrdin, &kbrdin_ops);
90
 
3963 jermar 91
    instance->i8042 = dev;
3877 decky 92
 
3963 jermar 93
    irq_initialize(&instance->irq);
4148 decky 94
    instance->irq.devno = device_assign_devno();
3963 jermar 95
    instance->irq.inr = inr;
96
    instance->irq.claim = i8042_claim;
97
    instance->irq.handler = i8042_irq_handler;
98
    instance->irq.instance = instance;
99
    irq_register(&instance->irq);
3877 decky 100
 
4251 decky 101
    /* Clear input buffer */
3958 jermar 102
    while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
3931 jermar 103
        (void) pio_read_8(&dev->data);
1956 decky 104
 
4094 decky 105
    return &instance->kbrdin;
1 jermar 106
}
508 jermar 107
 
4251 decky 108
/* Reset CPU by pulsing pin 0 */
109
void i8042_cpu_reset(i8042_t *dev)
110
{
111
    interrupts_disable();
112
 
113
    /* Clear input buffer */
114
    while (pio_read_8(&dev->status) & i8042_BUFFER_FULL_MASK)
115
        (void) pio_read_8(&dev->data);
116
 
117
    /* Reset CPU */
118
    pio_write_8(&dev->status, i8042_CPU_RESET);
119
}
120
 
1754 jermar 121
/** @}
1702 cejka 122
 */