| Jordan Crouse | 234e87f | 2008-04-10 22:50:44 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the libpayload project. |
| 3 | * |
| 4 | * Copyright (C) 2008 Advanced Micro Devices, Inc. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 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. |
| 16 | * |
| 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 |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include <libpayload.h> |
| 31 | #include <pci.h> |
| 32 | |
| 33 | static int find_on_bus(int bus, unsigned short vid, unsigned short did, |
| 34 | pcidev_t * dev) |
| 35 | { |
| 36 | int devfn; |
| 37 | unsigned int val; |
| 38 | unsigned char hdr; |
| 39 | |
| 40 | for (devfn = 0; devfn < 0x100; devfn++) { |
| 41 | pci_read_dword(bus, devfn, REG_VENDOR_ID, &val); |
| 42 | |
| 43 | if (val == 0xffffffff || val == 0x00000000 || |
| 44 | val == 0x0000ffff || val == 0xffff0000) |
| 45 | continue; |
| 46 | |
| 47 | if (val == ((did << 16) | vid)) { |
| 48 | *dev = PCIDEV(bus, devfn); |
| 49 | return 1; |
| 50 | } |
| 51 | |
| 52 | pci_read_byte(bus, devfn, REG_HEADER_TYPE, &hdr); |
| 53 | |
| 54 | hdr &= 0x7F; |
| 55 | |
| 56 | if (hdr == HEADER_TYPE_BRIDGE || hdr == HEADER_TYPE_CARDBUS) { |
| 57 | unsigned int busses; |
| 58 | pci_read_dword(bus, devfn, REG_PRIMARY_BUS, &busses); |
| 59 | if (find_on_bus((busses >> 8) & 0xFF, vid, did, dev)) |
| 60 | return 1; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | void pci_read_dword(unsigned int bus, unsigned int devfn, |
| 68 | unsigned int reg, unsigned int *val) |
| 69 | { |
| 70 | outl(PCI_ADDR(bus, devfn, reg), 0xCF8); |
| 71 | *val = inl(0xCFC); |
| 72 | } |
| 73 | |
| 74 | void pci_read_byte(unsigned int bus, unsigned int devfn, |
| 75 | unsigned int reg, unsigned char *val) |
| 76 | { |
| 77 | outl(PCI_ADDR(bus, devfn, reg), 0xCF8); |
| 78 | *val = inb(0xCFC + (reg & 3)); |
| 79 | } |
| 80 | |
| 81 | int pci_find_device(unsigned short vid, unsigned short did, pcidev_t * dev) |
| 82 | { |
| 83 | return find_on_bus(0, vid, did, dev); |
| 84 | } |
| 85 | |
| 86 | unsigned int pci_read_resource(pcidev_t dev, int bar) |
| 87 | { |
| 88 | unsigned int val; |
| 89 | pci_read_dword(PCIDEV_BUS(dev), PCIDEV_DEVFN(dev), 0x10 + (bar * 4), |
| 90 | &val); |
| 91 | return val; |
| 92 | } |