arch/sparc64/prom/devops.c

   1 /*
   2  * devops.c:  Device operations using the PROM.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   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 /* Open the device described by the string 'dstr'.  Returns the handle
  15  * to that device used for subsequent operations on that device.
  16  * Returns 0 on failure.
  17  */
  18 int
  19 prom_devopen(const char *dstr)
  20 {
  21         return p1275_cmd ("open", P1275_ARG(0,P1275_ARG_IN_STRING)|
  22                                   P1275_INOUT(1,1),
  23                                   dstr);
  24 }
  25
  26 /* Close the device described by device handle 'dhandle'. */
  27 int
  28 prom_devclose(int dhandle)
  29 {
  30         p1275_cmd ("close", P1275_INOUT(1,0), dhandle);
  31         return 0;
  32 }
  33
  34 /* Seek to specified location described by 'seekhi' and 'seeklo'
  35  * for device 'dhandle'.
  36  */
  37 void
  38 prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo)
  39 {
  40         p1275_cmd ("seek", P1275_INOUT(3,1), dhandle, seekhi, seeklo);
  41 }