2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <libpayload.h>
33 static int find_on_bus(int bus, unsigned short vid, unsigned short did,
40 for (devfn = 0; devfn < 0x100; devfn++) {
41 pci_read_dword(bus, devfn, REG_VENDOR_ID, &val);
43 if (val == 0xffffffff || val == 0x00000000 ||
44 val == 0x0000ffff || val == 0xffff0000)
47 if (val == ((did << 16) | vid)) {
48 *dev = PCIDEV(bus, devfn);
52 pci_read_byte(bus, devfn, REG_HEADER_TYPE, &hdr);
56 if (hdr == HEADER_TYPE_BRIDGE || hdr == HEADER_TYPE_CARDBUS) {
58 pci_read_dword(bus, devfn, REG_PRIMARY_BUS, &busses);
59 if (find_on_bus((busses >> 8) & 0xFF, vid, did, dev))
67 void pci_read_dword(unsigned int bus, unsigned int devfn,
68 unsigned int reg, unsigned int *val)
70 outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
74 void pci_read_byte(unsigned int bus, unsigned int devfn,
75 unsigned int reg, unsigned char *val)
77 outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
78 *val = inb(0xCFC + (reg & 3));
81 int pci_find_device(unsigned short vid, unsigned short did, pcidev_t * dev)
83 return find_on_bus(0, vid, did, dev);
86 unsigned int pci_read_resource(pcidev_t dev, int bar)
89 pci_read_dword(PCIDEV_BUS(dev), PCIDEV_DEVFN(dev), 0x10 + (bar * 4),