Viewing file:  oldlatches.c (1.68 KB) -rw-r--r--
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/*
* linux/arch/arm/kernel/oldlatches.c
*
* Copyright (C) David Alan Gilbert 1995/1996,2000
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Support for the latches on the old Archimedes which control the floppy,
* hard disc and printer
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/arch/oldlatches.h>
static unsigned char latch_a_copy;
static unsigned char latch_b_copy;
/* newval=(oldval & ~mask)|newdata */
void oldlatch_aupdate(unsigned char mask,unsigned char newdata)
{
if (machine_is_archimedes()) {
unsigned long flags;
local_save_flags(flags);
latch_a_copy = (latch_a_copy & ~mask) | newdata;
__raw_writeb(latch_a_copy, LATCHA_BASE);
local_restore_flags(flags);
printk("Latch: A = 0x%02x\n", latch_a_copy);
} else
BUG();
}
/* newval=(oldval & ~mask)|newdata */
void oldlatch_bupdate(unsigned char mask,unsigned char newdata)
{
if (machine_is_archimedes()) {
unsigned long flags;
local_save_flags(flags);
latch_b_copy = (latch_b_copy & ~mask) | newdata;
__raw_writeb(latch_b_copy, LATCHB_BASE);
local_restore_flags(flags);
printk("Latch: B = 0x%02x\n", latch_b_copy);
} else
BUG();
}
static int __init oldlatch_init(void)
{
if (machine_is_archimedes()) {
oldlatch_aupdate(0xff, 0xff);
/* Thats no FDC reset...*/
oldlatch_bupdate(0xff, LATCHB_FDCRESET);
}
return 0;
}
__initcall(oldlatch_init);
EXPORT_SYMBOL(oldlatch_aupdate);
EXPORT_SYMBOL(oldlatch_bupdate);
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