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);