File: /usr/src/linux/arch/arm/kernel/oldlatches.c

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     
23     static unsigned char latch_a_copy;
24     static unsigned char latch_b_copy;
25     
26     /* newval=(oldval & ~mask)|newdata */
27     void 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 */
44     void 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     
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     __initcall(oldlatch_init);
70     
71     EXPORT_SYMBOL(oldlatch_aupdate);
72     EXPORT_SYMBOL(oldlatch_bupdate);
73