1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #if defined(__i386__) || defined(__x86_64__)
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #include <helpers/helpers.h>
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun /*
7*4882a593Smuzhiyun * pci_acc_init
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * PCI access helper function depending on libpci
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * **pacc : if a valid pci_dev is returned
12*4882a593Smuzhiyun * *pacc must be passed to pci_acc_cleanup to free it
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * domain: domain
15*4882a593Smuzhiyun * bus: bus
16*4882a593Smuzhiyun * slot: slot
17*4882a593Smuzhiyun * func: func
18*4882a593Smuzhiyun * vendor: vendor
19*4882a593Smuzhiyun * device: device
20*4882a593Smuzhiyun * Pass -1 for one of the six above to match any
21*4882a593Smuzhiyun *
22*4882a593Smuzhiyun * Returns :
23*4882a593Smuzhiyun * struct pci_dev which can be used with pci_{read,write}_* functions
24*4882a593Smuzhiyun * to access the PCI config space of matching pci devices
25*4882a593Smuzhiyun */
pci_acc_init(struct pci_access ** pacc,int domain,int bus,int slot,int func,int vendor,int dev)26*4882a593Smuzhiyun struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
27*4882a593Smuzhiyun int slot, int func, int vendor, int dev)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct pci_filter filter_nb_link;
30*4882a593Smuzhiyun struct pci_dev *device;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun *pacc = pci_alloc();
33*4882a593Smuzhiyun if (*pacc == NULL)
34*4882a593Smuzhiyun return NULL;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun pci_filter_init(*pacc, &filter_nb_link);
37*4882a593Smuzhiyun filter_nb_link.domain = domain;
38*4882a593Smuzhiyun filter_nb_link.bus = bus;
39*4882a593Smuzhiyun filter_nb_link.slot = slot;
40*4882a593Smuzhiyun filter_nb_link.func = func;
41*4882a593Smuzhiyun filter_nb_link.vendor = vendor;
42*4882a593Smuzhiyun filter_nb_link.device = dev;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun pci_init(*pacc);
45*4882a593Smuzhiyun pci_scan_bus(*pacc);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun for (device = (*pacc)->devices; device; device = device->next) {
48*4882a593Smuzhiyun if (pci_filter_match(&filter_nb_link, device))
49*4882a593Smuzhiyun return device;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun pci_cleanup(*pacc);
52*4882a593Smuzhiyun return NULL;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun /* Typically one wants to get a specific slot(device)/func of the root domain
56*4882a593Smuzhiyun and bus */
pci_slot_func_init(struct pci_access ** pacc,int slot,int func)57*4882a593Smuzhiyun struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
58*4882a593Smuzhiyun int func)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun #endif /* defined(__i386__) || defined(__x86_64__) */
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