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/*
* detect_host_bridge.c
*
* This code is inspired by detect_grackle_bridge.c of SVGM BSP
* written by Till Straumann
* Copyright (C) 2001, 2003 Till Straumann <strauman@slac.stanford.edu>
*
* Copyright (C) 2004 S. Kate Feng, <feng1@bnl.gov>
* wrote it to support the MVME5500 board,
* under the Deaprtment of Energy contract DE-AC02-98CH10886.
*
*/
#include <libcpu/io.h>
#include <rtems/bspIo.h> /* printk */
#include <bsp/pci.h>
#include <bsp/gtreg.h>
#include <bsp/gtpcireg.h>
#include <stdio.h>
#include <string.h>
#define PCI_DEBUG 0
#define PCI_INVALID_VENDORDEVICEID 0xffffffff
#define PCI_MULTI_FUNCTION 0x80
unsigned long _BSP_clear_hostbridge_errors(int enableMCP, int quiet)
{
unsigned long pcidata=0;
unsigned short val;
int PciLocal, busNumber=0, loop;
/* On the mvme5500 board, the GT64260B system controller had the MCP
* signal pulled up high. Thus, the MCP signal is not used as it is
* on other boards such as mvme2307.
*/
if (enableMCP) return(-1);
for (PciLocal=0; PciLocal<2; PciLocal++ ) {
pci_read_config_word(busNumber,
0,
0,
PCI_STATUS,
&val);
if ( (val & PCI_STATUS_CLRERR_MASK) && (!quiet))
printk("Before _BSP_clear_hostbridge_errors(): PCI %d sts was 0x%x\n",
PciLocal, val);
if (!busNumber)
pcidata |= val;
else
pcidata |= (val <<16);
for ( loop=0; loop < 10; loop++) {
/* Clear the error on the host bridge */
pci_write_config_word(busNumber,
0,
0,
PCI_STATUS,
PCI_STATUS_CLRERR_MASK);
pci_read_config_word(busNumber,
0,
0,
PCI_STATUS,
&val);
if ( !(val & PCI_STATUS_CLRERR_MASK))
break;
else {
if (loop==9)
printk("BSP_clear_hostbridge_errors(): unable to clear pending hostbridge errors\n");
}
}
busNumber += BSP_MAX_PCI_BUS_ON_PCI0;
}
return(pcidata);
}
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