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/* 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_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<pci_bus_count(); 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;
}
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