forked from Imagelibrary/rtems
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* 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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <pci.h>
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#include <pci/cfg.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(struct pci_dev *dev, void *arg)
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{
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struct compare_info *info = arg;
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if ((dev->vendor != info->vendor) || (dev->device != info->device))
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return 0;
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if (info->index-- == 0)
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return (int)dev;
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else
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return 0;
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}
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/* Find a Device in PCI device tree located in RAM */
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int pci_find_dev(uint16_t ven, uint16_t dev, int index, struct pci_dev **ppdev)
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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_dev(compare_dev_id, &info);
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if (ppdev)
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*ppdev = (struct pci_dev *)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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