include/linux/mca-legacy.h

   1 /* -*- mode: c; c-basic-offset: 8 -*- */
   2
   3 /* This is the function prototypes for the old legacy MCA interface
   4  *
   5  * Please move your driver to the new sysfs based one instead */
   6
   7 #ifndef _LINUX_MCA_LEGACY_H
   8 #define _LINUX_MCA_LEGACY_H
   9
  10 #include <linux/mca.h>
  11
  12 /* #warning "MCA legacy - please move your driver to the new sysfs api" */
  13
  14 /* MCA_NOTFOUND is an error condition.  The other two indicate
  15  * motherboard POS registers contain the adapter.  They might be
  16  * returned by the mca_find_adapter() function, and can be used as
  17  * arguments to mca_read_stored_pos().  I'm not going to allow direct
  18  * access to the motherboard registers until we run across an adapter
  19  * that requires it.  We don't know enough about them to know if it's
  20  * safe.
  21  *
  22  * See Documentation/mca.txt or one of the existing drivers for
  23  * more information.
  24  */
  25 #define MCA_NOTFOUND    (-1)
  26
  27
  28
  29 /* Returns the slot of the first enabled adapter matching id.  User can
  30  * specify a starting slot beyond zero, to deal with detecting multiple
  31  * devices.  Returns MCA_NOTFOUND if id not found.  Also checks the
  32  * integrated adapters.
  33  */
  34 extern int mca_find_adapter(int id, int start);
  35 extern int mca_find_unused_adapter(int id, int start);
  36
  37 extern int mca_mark_as_used(int slot);
  38 extern void mca_mark_as_unused(int slot);
  39
  40 /* gets a byte out of POS register (stored in memory) */
  41 extern unsigned char mca_read_stored_pos(int slot, int reg);
  42
  43 /* This can be expanded later.  Right now, it gives us a way of
  44  * getting meaningful information into the MCA_info structure,
  45  * so we can have a more interesting /proc/mca.
  46  */
  47 extern void mca_set_adapter_name(int slot, char* name);
  48
  49 /* These routines actually mess with the hardware POS registers.  They
  50  * temporarily disable the device (and interrupts), so make sure you know
  51  * what you're doing if you use them.  Furthermore, writing to a POS may
  52  * result in two devices trying to share a resource, which in turn can
  53  * result in multiple devices sharing memory spaces, IRQs, or even trashing
  54  * hardware.  YOU HAVE BEEN WARNED.
  55  *
  56  * You can only access slots with this.  Motherboard registers are off
  57  * limits.
  58  */
  59
  60 /* read a byte from the specified POS register. */
  61 extern unsigned char mca_read_pos(int slot, int reg);
  62
  63 /* write a byte to the specified POS register. */
  64 extern void mca_write_pos(int slot, int reg, unsigned char byte);
  65
  66 #endif