64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#if defined(__i386__) || defined(__x86_64__)
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#include <helpers/helpers.h>
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/*
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* pci_acc_init
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*
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* PCI access helper function depending on libpci
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*
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* **pacc : if a valid pci_dev is returned
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* *pacc must be passed to pci_acc_cleanup to free it
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*
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* domain: domain
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* bus: bus
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* slot: slot
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* func: func
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* vendor: vendor
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* device: device
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* Pass -1 for one of the six above to match any
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*
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* Returns :
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* struct pci_dev which can be used with pci_{read,write}_* functions
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* to access the PCI config space of matching pci devices
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*/
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struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
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int slot, int func, int vendor, int dev)
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{
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struct pci_filter filter_nb_link;
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struct pci_dev *device;
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*pacc = pci_alloc();
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if (*pacc == NULL)
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return NULL;
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pci_filter_init(*pacc, &filter_nb_link);
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filter_nb_link.domain = domain;
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filter_nb_link.bus = bus;
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filter_nb_link.slot = slot;
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filter_nb_link.func = func;
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filter_nb_link.vendor = vendor;
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filter_nb_link.device = dev;
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pci_init(*pacc);
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pci_scan_bus(*pacc);
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for (device = (*pacc)->devices; device; device = device->next) {
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if (pci_filter_match(&filter_nb_link, device))
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return device;
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}
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pci_cleanup(*pacc);
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return NULL;
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}
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/* Typically one wants to get a specific slot(device)/func of the root domain
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and bus */
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struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
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int func)
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{
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return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
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}
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#endif /* defined(__i386__) || defined(__x86_64__) */
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