1/*
2 *  linux/arch/arm/kernel/oldlatches.c
3 *
4 *  Copyright (C) David Alan Gilbert 1995/1996,2000
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 *  Support for the latches on the old Archimedes which control the floppy,
11 *  hard disc and printer
12 */
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/sched.h>
17
18#include <asm/io.h>
19#include <asm/hardware.h>
20#include <asm/mach-types.h>
21#include <asm/arch/oldlatches.h>
22
23static unsigned char latch_a_copy;
24static unsigned char latch_b_copy;
25
26/* newval=(oldval & ~mask)|newdata */
27void oldlatch_aupdate(unsigned char mask,unsigned char newdata)
28{
29	if (machine_is_archimedes()) {
30		unsigned long flags;
31
32		local_save_flags(flags);
33		latch_a_copy = (latch_a_copy & ~mask) | newdata;
34		__raw_writeb(latch_a_copy, LATCHA_BASE);
35		local_restore_flags(flags);
36
37		printk("Latch: A = 0x%02x\n", latch_a_copy);
38	} else
39		BUG();
40}
41
42
43/* newval=(oldval & ~mask)|newdata */
44void oldlatch_bupdate(unsigned char mask,unsigned char newdata)
45{
46	if (machine_is_archimedes()) {
47		unsigned long flags;
48
49		local_save_flags(flags);
50		latch_b_copy = (latch_b_copy & ~mask) | newdata;
51		__raw_writeb(latch_b_copy, LATCHB_BASE);
52		local_restore_flags(flags);
53
54		printk("Latch: B = 0x%02x\n", latch_b_copy);
55	} else
56		BUG();
57}
58
59static int __init oldlatch_init(void)
60{
61	if (machine_is_archimedes()) {
62		oldlatch_aupdate(0xff, 0xff);
63		/* Thats no FDC reset...*/
64		oldlatch_bupdate(0xff, LATCHB_FDCRESET);
65	}
66	return 0;
67}
68
69__initcall(oldlatch_init);
70
71EXPORT_SYMBOL(oldlatch_aupdate);
72EXPORT_SYMBOL(oldlatch_bupdate);
73