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/* PCI Help function, Find a PCI device by VENDOR/DEVICE ID
*
* COPYRIGHT (c) 2010 Cobham Gaisler AB.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <pci.h>
#include <pci/access.h>
struct compare_info {
int index;
uint16_t vendor;
uint16_t device;
};
static int compare_dev_id(pci_dev_t pcidev, void *arg)
{
struct compare_info *info = arg;
uint16_t vid, did;
pci_cfg_r16(pcidev, PCIR_VENDOR, &vid);
pci_cfg_r16(pcidev, PCIR_DEVICE, &did);
if ((vid != info->vendor) || (did != info->device))
return 0;
if (info->index-- == 0)
return pcidev;
else
return 0;
}
/* Find a Device in PCI configuration space */
int pci_find(uint16_t ven, uint16_t dev, int index, pci_dev_t *pdev)
{
struct compare_info info;
int result;
info.index = index;
info.vendor = ven;
info.device = dev;
result = pci_for_each(compare_dev_id, &info);
if (pdev)
*pdev = (pci_dev_t)result;
if (result == 0)
return -1;
else
return 0;
}
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