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