/*
* Copyright (C) 2001-2004 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup genarch
* @{
*/
/**
* @file
* @brief i8042 processor driver.
*
* It takes care of low-level keyboard functions.
*/
#include <genarch/kbd/i8042.h>
#include <genarch/kbd/key.h>
#include <genarch/kbd/scanc.h>
#include <genarch/kbd/scanc_pc.h>
#include <arch/drivers/i8042.h>
#include <arch/interrupt.h>
#include <cpu.h>
#include <arch/asm.h>
#include <arch.h>
#include <typedefs.h>
#include <console/chardev.h>
#include <console/console.h>
#include <interrupt.h>
/* Keyboard commands. */
#define KBD_ENABLE 0xf4
#define KBD_DISABLE 0xf5
#define KBD_ACK 0xfa
/*
* 60 Write 8042 Command Byte: next data byte written to port 60h is
* placed in 8042 command register. Format:
*
* |7|6|5|4|3|2|1|0|8042 Command Byte
* | | | | | | | `---- 1=enable output register full interrupt
* | | | | | | `----- should be 0
* | | | | | `------ 1=set status register system, 0=clear
* | | | | `------- 1=override keyboard inhibit, 0=allow inhibit
* | | | `-------- disable keyboard I/O by driving clock line low
* | | `--------- disable auxiliary device, drives clock line low
* | `---------- IBM scancode translation 0=AT, 1=PC/XT
* `----------- reserved, should be 0
*/
#define i8042_SET_COMMAND 0x60
#define i8042_COMMAND 0x69
#define i8042_BUFFER_FULL_MASK 0x01
#define i8042_WAIT_MASK 0x02
#define i8042_MOUSE_DATA 0x20
static void i8042_suspend(chardev_t *);
static void i8042_resume(chardev_t *);
static chardev_operations_t ops = {
.suspend = i8042_suspend,
.resume = i8042_resume,
.read = i8042_key_read
};
static void i8042_interrupt(int n, istate_t *istate);
static void i8042_wait(void);
static iroutine oldvector;
/** Initialize keyboard and service interrupts using kernel routine */
void i8042_grab(void)
{
oldvector = exc_register(VECTOR_KBD, "i8042_interrupt", (iroutine) i8042_interrupt);
i8042_wait();
i8042_command_write(i8042_SET_COMMAND);
i8042_wait();
i8042_data_write(i8042_COMMAND);
i8042_wait();
}
/** Resume the former interrupt vector */
void i8042_release(void)
{
if (oldvector)
exc_register(VECTOR_KBD, "user_interrupt", oldvector);
}
/** Initialize i8042. */
void i8042_init(void)
{
int i;
i8042_grab();
/* Prevent user from accidentaly releasing calling i8042_resume
* and disabling keyboard
*/
oldvector = NULL;
trap_virtual_enable_irqs(1<<IRQ_KBD);
chardev_initialize("i8042_kbd", &kbrd, &ops);
stdin = &kbrd;
/*
* Clear input buffer.
* Number of iterations is limited to prevent infinite looping.
*/
for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {
i8042_data_read();
}
}
/** Process i8042 interrupt.
*
* @param n Interrupt vector.
* @param istate Interrupted state.
*/
void i8042_interrupt(int n, istate_t *istate)
{
uint8_t x;
uint8_t status;
while (((status=i8042_status_read()) & i8042_BUFFER_FULL_MASK)) {
x = i8042_data_read();
if ((status & i8042_MOUSE_DATA))
continue;
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
key_pressed(x);
}
trap_virtual_eoi();
}
/** Wait until the controller reads its data. */
void i8042_wait(void) {
while (i8042_status_read() & i8042_WAIT_MASK) {
/* wait */
}
}
/* Called from getc(). */
void i8042_resume(chardev_t *d)
{
}
/* Called from getc(). */
void i8042_suspend(chardev_t *d)
{
}
char i8042_key_read(chardev_t *d)
{
char ch;
while(!(ch = active_read_buff_read())) {
uint8_t x;
while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))
;
x = i8042_data_read();
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
active_read_key_pressed(x);
}
return ch;
}
/** Poll for key press and release events.
*
* This function can be used to implement keyboard polling.
*/
void i8042_poll(void)
{
uint8_t x;
while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {
x = i8042_data_read();
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
key_pressed(x);
}
}
/** @}
*/