arch/sparc/prom/devmap.c

   1 /*
   2  * promdevmap.c:  Map device/IO areas to virtual addresses.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #include <linux/types.h>
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10
  11 #include <asm/openprom.h>
  12 #include <asm/oplib.h>
  13
  14 extern void restore_current(void);
  15
  16 /* Just like the routines in palloc.c, these should not be used
  17  * by the kernel at all.  Bootloader facility mainly.  And again,
  18  * this is only available on V2 proms and above.
  19  */
  20
  21 /* Map physical device address 'paddr' in IO space 'ios' of size
  22  * 'num_bytes' to a virtual address, with 'vhint' being a hint to
  23  * the prom as to where you would prefer the mapping.  We return
  24  * where the prom actually mapped it.
  25  */
  26 char *
  27 prom_mapio(char *vhint, int ios, unsigned int paddr, unsigned int num_bytes)
  28 {
  29         unsigned long flags;
  30         char *ret;
  31
  32         spin_lock_irqsave(&prom_lock, flags);
  33         if((num_bytes == 0) || (paddr == 0)) ret = (char *) 0x0;
  34         else
  35         ret = (*(romvec->pv_v2devops.v2_dumb_mmap))(vhint, ios, paddr,
  36                                                     num_bytes);
  37         restore_current();
  38         spin_unlock_irqrestore(&prom_lock, flags);
  39         return ret;
  40 }
  41
  42 /* Unmap an IO/device area that was mapped using the above routine. */
  43 void
  44 prom_unmapio(char *vaddr, unsigned int num_bytes)
  45 {
  46         unsigned long flags;
  47
  48         if(num_bytes == 0x0) return;
  49         spin_lock_irqsave(&prom_lock, flags);
  50         (*(romvec->pv_v2devops.v2_dumb_munmap))(vaddr, num_bytes);
  51         restore_current();
  52         spin_unlock_irqrestore(&prom_lock, flags);
  53         return;
  54 }