Linux-2.6.12-rc2
[linux-2.6.git] / arch / arm26 / machine / latches.c
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
24 static unsigned char latch_a_copy;
25 static unsigned char latch_b_copy;
26
27 /* newval=(oldval & ~mask)|newdata */
28 void 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); //FIXME: was local_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 */
44 void 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);//FIXME: was local_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
59 static 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 arch_initcall(oldlatch_init);
70
71 EXPORT_SYMBOL(oldlatch_aupdate);
72 EXPORT_SYMBOL(oldlatch_bupdate);