src/device/device_romstage.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2003-2004 Linux Networx
   5  * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
   6  * Copyright (C) 2003 Greg Watson <jarrah@users.sourceforge.net>
   7  * Copyright (C) 2004 Li-Ta Lo <ollie@lanl.gov>
   8  * Copyright (C) 2005-2006 Tyan
   9  * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; version 2 of the License.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc.
  23  */
  24
  25 #include <device/device.h>
  26 #include <device/path.h>
  27 #include <device/pci.h>
  28 #include <device/resource.h>
  29
  30 /** Linked list of ALL devices */
  31 ROMSTAGE_CONST struct device * ROMSTAGE_CONST all_devices = &dev_root;
  32
  33 /**
  34  * Given a PCI bus and a devfn number, find the device structure.
  35  *
  36  * @param bus The bus number.
  37  * @param devfn A device/function number.
  38  * @return Pointer to the device structure (if found), 0 otherwise.
  39  */
  40 ROMSTAGE_CONST struct device *dev_find_slot(unsigned int bus,
  41                                                 unsigned int devfn)
  42 {
  43         ROMSTAGE_CONST struct device *dev, *result;
  44
  45         result = 0;
  46         for (dev = all_devices; dev; dev = dev->next) {
  47                 if ((dev->path.type == DEVICE_PATH_PCI) &&
  48                     (dev->bus->secondary == bus) &&
  49                     (dev->path.pci.devfn == devfn)) {
  50                         result = dev;
  51                         break;
  52                 }
  53         }
  54         return result;
  55 }
  56
  57 /**
  58  * Given a device pointer, find the next PCI device.
  59  *
  60  * @param previous_dev A pointer to a PCI device structure.
  61  * @return Pointer to the next device structure (if found), 0 otherwise.
  62  */
  63 ROMSTAGE_CONST struct device *dev_find_next_pci_device(
  64                 ROMSTAGE_CONST struct device *previous_dev)
  65 {
  66         ROMSTAGE_CONST struct device *dev, *result;
  67
  68         if (previous_dev == NULL)
  69                 previous_dev = all_devices;
  70
  71         result = 0;
  72         for (dev = previous_dev->next; dev; dev = dev->next) {
  73                 if (dev->path.type == DEVICE_PATH_PCI) {
  74                         result = dev;
  75                         break;
  76                 }
  77         }
  78         return result;
  79 }
  80
  81 /**
  82  * Given an SMBus bus and a device number, find the device structure.
  83  *
  84  * @param bus The bus number.
  85  * @param addr A device number.
  86  * @return Pointer to the device structure (if found), 0 otherwise.
  87  */
  88 ROMSTAGE_CONST struct device *dev_find_slot_on_smbus(unsigned int bus,
  89                                                         unsigned int addr)
  90 {
  91         ROMSTAGE_CONST struct device *dev, *result;
  92
  93         result = 0;
  94         for (dev = all_devices; dev; dev = dev->next) {
  95                 if ((dev->path.type == DEVICE_PATH_I2C) &&
  96                     (dev->bus->secondary == bus) &&
  97                     (dev->path.i2c.device == addr)) {
  98                         result = dev;
  99                         break;
 100                 }
 101         }
 102         return result;
 103 }
 104
 105 /**
 106  * Given a PnP port and a device number, find the device structure.
 107  *
 108  * @param port The I/O port.
 109  * @param device Logical device number.
 110  * @return Pointer to the device structure (if found), 0 otherwise.
 111  */
 112 ROMSTAGE_CONST struct device *dev_find_slot_pnp(u16 port, u16 device)
 113 {
 114         ROMSTAGE_CONST struct device *dev;
 115
 116         for (dev = all_devices; dev; dev = dev->next) {
 117                 if ((dev->path.type == DEVICE_PATH_PNP) &&
 118                     (dev->path.pnp.port == port) &&
 119                     (dev->path.pnp.device == device)) {
 120                         return dev;
 121                 }
 122         }
 123         return 0;
 124 }