1/*
2 *  linux/arch/arm26/kernel/latches.c
3 *
4 *  Copyright (C) David Alan Gilbert 1995/1996,2000
5 *  Copyright (C) Ian Molton 2003
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *  Support for the latches on the old Archimedes which control the floppy,
12 *  hard disc and printer
13 */
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/sched.h>
18
19#include <asm/io.h>
20#include <asm/hardware.h>
21#include <asm/mach-types.h>
22#include <asm/oldlatches.h>
23
24static unsigned char latch_a_copy;
25static unsigned char latch_b_copy;
26
27/* newval=(oldval & ~mask)|newdata */
28void oldlatch_aupdate(unsigned char mask,unsigned char newdata)
29{
30	unsigned long flags;
31
32	BUG_ON(!machine_is_archimedes());
33
34	local_irq_save(flags);
35	latch_a_copy = (latch_a_copy & ~mask) | newdata;
36	__raw_writeb(latch_a_copy, LATCHA_BASE);
37	local_irq_restore(flags);
38
39	printk("Latch: A = 0x%02x\n", latch_a_copy);
40}
41
42
43/* newval=(oldval & ~mask)|newdata */
44void oldlatch_bupdate(unsigned char mask,unsigned char newdata)
45{
46	unsigned long flags;
47
48	BUG_ON(!machine_is_archimedes());
49
50
51	local_irq_save(flags);
52	latch_b_copy = (latch_b_copy & ~mask) | newdata;
53	__raw_writeb(latch_b_copy, LATCHB_BASE);
54	local_irq_restore(flags);
55
56	printk("Latch: B = 0x%02x\n", latch_b_copy);
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
69arch_initcall(oldlatch_init);
70
71EXPORT_SYMBOL(oldlatch_aupdate);
72EXPORT_SYMBOL(oldlatch_bupdate);
73