// SPDX-License-Identifier: GPL-2.0
#if defined(__i386__) || defined(__x86_64__)

#include <helpers/helpers.h>

/*
 * pci_acc_init
 *
 * PCI access helper function depending on libpci
 *
 * **pacc : if a valid pci_dev is returned
 *         *pacc must be passed to pci_acc_cleanup to free it
 *
 * domain: domain
 * bus:    bus
 * slot:   slot
 * func:   func
 * vendor: vendor
 * device: device
 * Pass -1 for one of the six above to match any
 *
 * Returns :
 * struct pci_dev which can be used with pci_{read,write}_* functions
 *                to access the PCI config space of matching pci devices
 */
struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
                             int slot, int func, int vendor, int dev)
{
        struct pci_filter filter_nb_link;
        struct pci_dev *device;

        *pacc = pci_alloc();
        if (*pacc == NULL)
                return NULL;

        pci_filter_init(*pacc, &filter_nb_link);
        filter_nb_link.domain   = domain;
        filter_nb_link.bus      = bus;
        filter_nb_link.slot     = slot;
        filter_nb_link.func     = func;
        filter_nb_link.vendor   = vendor;
        filter_nb_link.device   = dev;

        pci_init(*pacc);
        pci_scan_bus(*pacc);

        for (device = (*pacc)->devices; device; device = device->next) {
                if (pci_filter_match(&filter_nb_link, device))
                        return device;
        }
        pci_cleanup(*pacc);
        return NULL;
}

/* Typically one wants to get a specific slot(device)/func of the root domain
   and bus */
struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
                                       int func)
{
        return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
}

#endif /* defined(__i386__) || defined(__x86_64__) */