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_irq_save(flags);
  33                 latch_a_copy = (latch_a_copy & ~mask) | newdata;
  34                 __raw_writeb(latch_a_copy, LATCHA_BASE);
  35                 local_irq_restore(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_irq_save(flags);
  50                 latch_b_copy = (latch_b_copy & ~mask) | newdata;
  51                 __raw_writeb(latch_b_copy, LATCHB_BASE);
  52                 local_irq_restore(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);