source: rtems/c/src/lib/libbsp/powerpc/mvme5500/pci/pcifinddevice.c @ ee732739

/* pcifinddevice.c
 *
 * Copyright 2001,  Till Straumann <strauman@slac.stanford.edu> 
 *
 * find a particular PCI device
 * (we assume, the firmware configured the PCI bus[es] for us)
 *
 * 
 * Kate Feng <feng1@bnl.gov>, modified it to support the mvme5500 board.
 * 
 */

#define PCI_INVALID_VENDORDEVICEID      0xffffffff
#define PCI_MULTI_FUNCTION                      0x80


#include <bsp/pci.h>
#include <rtems/bspIo.h>
#include <bsp.h>

int BSP_pciDebug=0;

int BSP_pciFindDevicePrint(unsigned short vendorid, unsigned short deviceid,
                   int instance, int *pbus, int *pdev, int *pfun )
{
  int x;

  BSP_pciDebug = 1;
  x=pci_find_device(vendorid, deviceid, instance, pbus, pdev, pfun );
  BSP_pciDebug = 0;

  return 0;
}  

int pci_find_device( unsigned short vendorid, unsigned short deviceid,
                   int instance, int *pbus, int *pdev, int *pfun )
{
  unsigned int d;
  unsigned short s;
  unsigned char bus,dev,fun,hd;

  for (bus=0; bus<BSP_MAX_PCI_BUS;  bus++) {
      for (dev=0; dev<PCI_MAX_DEVICES; dev++) {
          pci_read_config_byte(bus, dev, 0, PCI_HEADER_TYPE, &hd);
          hd = (hd & PCI_MULTI_FUNCTION ? PCI_MAX_FUNCTIONS : 1);
          for (fun=0; fun<hd; fun++) {
              /* 
               * The last devfn id/slot is special; must skip it
               */
              if (PCI_MAX_DEVICES-1==dev && PCI_MAX_FUNCTIONS-1 == fun)
                 break;
              (void)pci_read_config_dword(bus,dev,fun,PCI_VENDOR_ID,&d);
              if (PCI_INVALID_VENDORDEVICEID == d)
                 continue;
              if (BSP_pciDebug) {
                 printk("pci_find_device: found 0x%08x at %2d/%2d/%2d ",d,bus,dev,fun);
                 printk("(Physically: PCI%d  %2d/%2d/%2d)\n", 
                     (bus>= BSP_MAX_PCI_BUS_ON_PCI0)? 1:0, 
                     (bus>= BSP_MAX_PCI_BUS_ON_PCI0)? bus-BSP_MAX_PCI_BUS_ON_PCI0:bus,
                     dev, fun);
              }

              (void)pci_read_config_word(bus,dev,fun,PCI_VENDOR_ID,&s);
              if (vendorid != s)
                 continue;
              (void)pci_read_config_word(bus,dev,fun,PCI_DEVICE_ID,&s);
              if (deviceid == s) {
                 if (instance--) continue;
                 *pbus=bus; *pdev=dev; *pfun=fun;
                 return 0;
              }
          }
      }
  }  /* end for bus */
  return -1;
}

/* eof */