source: rtems/cpukit/libpci/pci_for_each.c

/* SPDX-License-Identifier: BSD-2-Clause */

/*  PCI Help Function, iterate over all PCI devices. Find devices by cfg access.
 *
 *  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>

/*#define DEBUG*/

#ifdef DEBUG
#include <rtems/bspIo.h>
#define DBG(args...) printk(args)
#else
#define DBG(args...)
#endif

int pci_for_each(int (*func)(pci_dev_t, void*), void *arg)
{
        uint32_t id;
        uint8_t hd;
        int bus, dev, fun, result, fail;
        int maxbus = pci_bus_count();
        pci_dev_t pcidev;

        for (bus = 0; bus < maxbus ; bus++) {
                for (dev = 0; dev <= PCI_SLOTMAX; dev++) {
                        pcidev = PCI_DEV(bus, dev, 0);

                        for (fun = 0; fun <= PCI_FUNCMAX; fun++, pcidev++) {
                                fail = pci_cfg_r32(pcidev, PCIR_VENDOR, &id);
                                if (fail || (0xffffffff == id) || (0 == id)) {
                                        if (fun == 0)
                                                break;
                                        else
                                                continue;
                                }

                                DBG("pcibus_for_each: found 0x%08lx at"
                                    " %d/%d/%d\n", id, bus, dev, fun);
                                result = func(pcidev, arg);
                                if (result != 0)
                                        return result; /* Stopped */

                                /* Stop if not a multi-function device */
                                if (fun == 0) {
                                        pci_cfg_r8(pcidev, PCIR_HDRTYPE,
                                                        &hd);
                                        if ((hd & PCIM_MFDEV) == 0)
                                                break;
                                }
                        }
                }
        }

        return 0; /* scanned all */
}