arch/arm/mach-arc/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
  17 #include <asm/io.h>
  18 #include <asm/hardware.h>
  19 #include <asm/mach-types.h>
  20 #include <asm/arch/oldlatches.h>
  21
  22 static unsigned char latch_a_copy;
  23 static unsigned char latch_b_copy;
  24
  25 /* newval=(oldval & ~mask)|newdata */
  26 void oldlatch_aupdate(unsigned char mask,unsigned char newdata)
  27 {
  28         if (machine_is_archimedes()) {
  29                 unsigned long flags;
  30
  31                 local_save_flags(flags);
  32                 latch_a_copy = (latch_a_copy & ~mask) | newdata;
  33                 __raw_writeb(latch_a_copy, LATCHA_BASE);
  34                 local_restore_flags(flags);
  35
  36                 printk("Latch: A = 0x%02x\n", latch_a_copy);
  37         } else
  38                 BUG();
  39 }
  40
  41
  42 /* newval=(oldval & ~mask)|newdata */
  43 void oldlatch_bupdate(unsigned char mask,unsigned char newdata)
  44 {
  45         if (machine_is_archimedes()) {
  46                 unsigned long flags;
  47
  48                 local_save_flags(flags);
  49                 latch_b_copy = (latch_b_copy & ~mask) | newdata;
  50                 __raw_writeb(latch_b_copy, LATCHB_BASE);
  51                 local_restore_flags(flags);
  52
  53                 printk("Latch: B = 0x%02x\n", latch_b_copy);
  54         } else
  55                 BUG();
  56 }
  57
  58 static int __init oldlatch_init(void)
  59 {
  60         if (machine_is_archimedes()) {
  61                 oldlatch_aupdate(0xff, 0xff);
  62                 /* Thats no FDC reset...*/
  63                 oldlatch_bupdate(0xff, LATCHB_FDCRESET);
  64         }
  65         return 0;
  66 }
  67
  68 __initcall(oldlatch_init);
  69
  70 EXPORT_SYMBOL(oldlatch_aupdate);
  71 EXPORT_SYMBOL(oldlatch_bupdate);