cpukit/libpci/pci_get_dev.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*  PCI Help function, Find a PCI device by BUS|SLOT|FUNCTION
0004  *
0005  *  COPYRIGHT (c) 2010 Cobham Gaisler AB.
0006  *
0007  * Redistribution and use in source and binary forms, with or without
0008  * modification, are permitted provided that the following conditions
0009  * are met:
0010  * 1. Redistributions of source code must retain the above copyright
0011  *    notice, this list of conditions and the following disclaimer.
0012  * 2. Redistributions in binary form must reproduce the above copyright
0013  *    notice, this list of conditions and the following disclaimer in the
0014  *    documentation and/or other materials provided with the distribution.
0015  *
0016  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0017  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0018  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0019  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0020  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0021  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0022  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0023  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0024  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0025  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0026  * POSSIBILITY OF SUCH DAMAGE.
0027  */
0028
0029 #include <pci.h>
0030 #include <pci/cfg.h>
0031
0032 static int compare_dev_pcidev(struct pci_dev *dev, void *arg)
0033 {
0034     pci_dev_t pcidev = (unsigned)arg;
0035
0036     if (dev->busdevfun == pcidev)
0037         return (int)dev;
0038     else
0039         return 0;
0040 }
0041
0042 /* Get a Device in PCI device tree located in RAM by PCI BUS|SLOT|FUNCTION */
0043 int pci_get_dev(pci_dev_t pcidev, struct pci_dev **ppdev)
0044 {
0045     int result;
0046
0047     result = pci_for_each_dev(compare_dev_pcidev, (void *)(unsigned)pcidev);
0048     if (ppdev)
0049         *ppdev = (struct pci_dev *)result;
0050     if (result == 0)
0051         return -1;
0052     else
0053         return 0;
0054 }