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/* SPDX-License-Identifier: BSD-2-Clause */
/* PCI Help function, Find a PCI device by VENDOR/DEVICE ID
*
* COPYRIGHT (c) 2010 Cobham Gaisler AB.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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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