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/* $Id: hw-access.c,v 1.8 1998/05/07 02:57:15 ralf Exp $
*
* Low-level hardware access stuff for Jazz family machines.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995, 1996, 1997 by Ralf Baechle
*/
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <asm/addrspace.h>
#include <asm/jazz.h>
#include <asm/jazzdma.h>
#include <asm/keyboard.h>
#include <asm/pgtable.h>
static volatile keyboard_hardware *jazz_kh =
(keyboard_hardware *) JAZZ_KEYBOARD_ADDRESS;
#define KBD_STAT_IBF 0x02 /* Keyboard input buffer full */
static unsigned char jazz_read_input(void)
{
return jazz_kh->data;
}
static void jazz_write_output(unsigned char val)
{
int status;
do {
status = jazz_kh->command;
} while (status & KBD_STAT_IBF);
jazz_kh->data = val;
}
static void jazz_write_command(unsigned char val)
{
int status;
do {
status = jazz_kh->command;
} while (status & KBD_STAT_IBF);
jazz_kh->command = val;
}
static unsigned char jazz_read_status(void)
{
return jazz_kh->command;
}
__initfunc(void jazz_keyboard_setup(void))
{
kbd_read_input = jazz_read_input;
kbd_write_output = jazz_write_output;
kbd_write_command = jazz_write_command;
kbd_read_status = jazz_read_status;
request_region(0x60, 16, "keyboard");
r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) |
JAZZ_IE_KEYBOARD);
}
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