source: rtems/c/src/lib/libbsp/powerpc/shared/pci/pcifinddevice.c @ 3120019

/* Author: Till Straumann <strauman@slac.stanford.edu>, 2001 */

/* find a particular PCI device
 * (we assume, the firmware configured the PCI bus[es] for us)
 *
 * $Id$
 */

#define PCI_INVALID_VENDORDEVICEID      0xffffffff
#define PCI_MULTI_FUNCTION                      0x80

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

int
pci_find_by_devid( 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<BusCountPCI(); 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;
#ifdef PCI_DEBUG
                        printk("pci_find_by_devid: found 0x%08x at %d/%d/%d\n",d,bus,dev,fun);
#endif
                        (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;
                        }
                }
      }
        }
    return -1;
}

/* eof */