/*
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994, 1997.
* On-Line Applications Research Corporation (OAR).
*
* $Id$
*/
#include <rtems.h>
#include <assert.h>
#include <stdio.h>
#include <bsp.h>
/*
* Forced delay to get around timing problems with the UNIVERSE chip. The
* two nops are used so that the delay works for varying clock frequencies,
* up to 66 Mhz, with margin. Each nop averages about 1 1/2 clock ticks,
* and since there are 2 nops, this routine takes about 3 clock ticks,
* which on a worst case 66 Mhz board, is 45 nanosecond. This time period
* is sufficient to guarantee a work-around to the UNIVERSE chip timing
* problem. The problem is that when there are two successive accesses to
* an UNIVERSE register, without sufficient delay, the second access will
* not work correctly.
*/
void PCI_bus_delay ()
{
asm(" nop");
asm(" nop");
}
/*
* PCI_bus_write
*/
void PCI_bus_write(
volatile rtems_unsigned32 * _addr, /* IN */
rtems_unsigned32 _data /* IN */
)
{
_data = Convert_Endian_32( _data );
*_addr = _data;
}
rtems_unsigned32 PCI_bus_read(
volatile rtems_unsigned32 * _addr /* IN */
)
{
rtems_unsigned32 data;
data = *_addr;
data = Convert_Endian_32( data );
return data;
}
/*
* PCI Configuration Cycle Read/Write Access which is used to access all of
* devices registers on the PCI bus. i.e.: Universe, Ethernet & PMC.
*/
rtems_unsigned32 Read_pci_device_register(
rtems_unsigned32 address
)
{
rtems_unsigned32 data;
/*
* Write the PCI configuration address
*/
PCI_bus_write( (volatile rtems_unsigned32 *)SCORE603E_PCI_IO_CFG_ADDR, address );
/*
* Delay needed when running out of DRAM
*/
PCI_bus_delay ();
/*
* read data
*/
data = PCI_bus_read( (volatile rtems_unsigned32 *)SCORE603E_PCI_IO_CFG_DATA );
return data;
}
void Write_pci_device_register(
rtems_unsigned32 address,
rtems_unsigned32 data
)
{
/*
* Write the PCI configuration address
*/
PCI_bus_write( (volatile rtems_unsigned32 *)SCORE603E_PCI_IO_CFG_ADDR, address );
/*
* Delay needed when running out of DRAM
*/
PCI_bus_delay ();
/*
* write data
*/
PCI_bus_write( (volatile rtems_unsigned32 *)SCORE603E_PCI_IO_CFG_DATA, data );
}
