2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
5 * Copyright (C) 2008 coresystems GmbH
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <libpayload.h>
34 u8 pci_read_config8(pcidev_t device, u16 reg)
36 outl(device | (reg & ~3), 0xCF8);
37 return inb(0xCFC + (reg & 3));
40 u16 pci_read_config16(pcidev_t device, u16 reg)
42 outl(device | (reg & ~3), 0xCF8);
43 return inw(0xCFC + (reg & 3));
46 u32 pci_read_config32(pcidev_t device, u16 reg)
48 outl(device | (reg & ~3), 0xCF8);
49 return inl(0xCFC + (reg & 3));
52 void pci_write_config8(pcidev_t device, u16 reg, u8 val)
54 outl(device | (reg & ~3), 0xCF8);
55 outb(val, 0xCFC + (reg & 3));
58 void pci_write_config16(pcidev_t device, u16 reg, u16 val)
60 outl(device | (reg & ~3), 0xCF8);
61 outw(val, 0xCFC + (reg & 3));
64 void pci_write_config32(pcidev_t device, u16 reg, u32 val)
66 outl(device | (reg & ~3), 0xCF8);
67 outl(val, 0xCFC + (reg & 3));
70 static int find_on_bus(int bus, unsigned short vid, unsigned short did,
77 for (devfn = 0; devfn < 0x100; devfn++) {
78 int func = devfn & 0x7;
79 int slot = (devfn >> 3) & 0x1f;
81 val = pci_read_config32(PCI_DEV(bus, slot, func),
84 if (val == 0xffffffff || val == 0x00000000 ||
85 val == 0x0000ffff || val == 0xffff0000)
88 if (val == ((did << 16) | vid)) {
89 *dev = PCI_DEV(bus, slot, func);
93 hdr = pci_read_config8(PCI_DEV(bus, slot, func),
97 if (hdr == HEADER_TYPE_BRIDGE || hdr == HEADER_TYPE_CARDBUS) {
99 busses = pci_read_config32(PCI_DEV(bus, slot, func),
101 busses = (busses >> 8) & 0xFF;
103 /* Avoid recursion if the new bus is the same as
104 * the old bus (insert lame The Who joke here) */
106 if ((busses != bus) &&
107 find_on_bus(busses, vid, did, dev))
115 int pci_find_device(u16 vid, u16 did, pcidev_t * dev)
117 return find_on_bus(0, vid, did, dev);
120 u32 pci_read_resource(pcidev_t dev, int bar)
122 return pci_read_config32(dev, 0x10 + (bar * 4));
125 void pci_set_bus_master(pcidev_t dev)
127 u16 val = pci_read_config16(dev, REG_COMMAND);
128 val |= REG_COMMAND_BM;
129 pci_write_config16(dev, REG_COMMAND, val);