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pcioDrv.c

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/************************************************************
  File: pcioDrv.c

  Author: Steven Legowik

  Description:
  Provides an easy to use interface to the pcio device
  driver.

  For improved compatability with the old io access functions
  (declared in pcio.h) and ease of use, I have rewritten the input and
  output operations to make use of the pcio device driver.  If you use
  this interface you will only have to change the include file to
  pcioDrv.h (from pcio.h).  All the rest of the code should remain
  unchanged.  The input and output routines make use of a global file
  descriptor initialize by pcioInit() in ioctl() calls to the driver.
  To used this interface to the driver pcioDrv.o must be linked into the
  application and pcioDrv.h must be included wherever the driver is
  accessed.

  Modification history:

  19-Apr-1995  Fred Proctor reported error when driver not installed
  7-Mar-1995  Fred Proctor removed #include <oscalls.h>, since this
  is obsolete in 2.2.2 .
  21-Dec-1994  Fred Proctor added check for 0 file descriptor
  in read, write calls, and called pcioInit() implicitly. This
  removes the need for users to call pcioInit() directly.
  ??? Steve Legowik created

************************************************************/

#include <stdio.h>              /* fprintf(), stderr */
#include "pcioDrv.h"
#include "iodev.h"

static int pcioDrvId = 0;       /* global pcio device descriptor */

/* initialize global pcio device descriptor */
void
  pcioInit()
{
  if ((pcioDrvId = open("/dev/pcio", 0)) < 0)
  {
    fprintf(stderr, "pcioInit: can't open /dev/pcio");
  }
}

unsigned char
  inputb( unsigned short port )
{
  struct _ioValStruct arg;
  arg.address = port;
  if (0 == pcioDrvId)
    pcioInit();
  ioctl( pcioDrvId, READ_8, &arg );
  return arg.value;
}

void
  outputb( unsigned short port, unsigned char data )
{
  struct _ioValStruct arg;
  arg.address = port;
  arg.value = data;
  if (0 == pcioDrvId)
    pcioInit();
  ioctl( pcioDrvId, WRITE_8, &arg );
}

unsigned short
  inputw( unsigned short port )
{
  struct _ioValStruct arg;
  arg.address = port;
  if (0 == pcioDrvId)
    pcioInit();
  ioctl( pcioDrvId, READ_16, &arg );
  return arg.value;
}

void
  outputw( unsigned short port, unsigned short data )
{
  struct _ioValStruct arg;
  arg.address = port;
  arg.value = data;
  if (0 == pcioDrvId)
    pcioInit();
  ioctl( pcioDrvId, WRITE_16, &arg );
}

unsigned long
  inputl( unsigned short port )
{
  struct _ioValStruct arg;
  arg.address = port;
  if (0 == pcioDrvId)
    pcioInit();
  ioctl( pcioDrvId, READ_32, &arg );
  return arg.value;
}

void
  outputl( unsigned short port, unsigned long data )
{
  struct _ioValStruct arg;
  arg.address = port;
  arg.value = data;
  if (0 == pcioDrvId)
    pcioInit();
  ioctl( pcioDrvId, WRITE_32, &arg );
}

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