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
  21 #include <device/device.h>
  22 #include <device/path.h>
  23 #include <device/pci.h>
  24 #include <device/resource.h>
  25
  26 /** Linked list of ALL devices */
  27 ROMSTAGE_CONST struct device * ROMSTAGE_CONST all_devices = &dev_root;
  28
  29 /**
  30  * Given a PCI bus and a devfn number, find the device structure.
  31  *
  32  * @param bus The bus number.
  33  * @param devfn A device/function number.
  34  * @return Pointer to the device structure (if found), 0 otherwise.
  35  */
  36 ROMSTAGE_CONST struct device *dev_find_slot(unsigned int bus,
  37                                                 unsigned int devfn)
  38 {
  39         ROMSTAGE_CONST struct device *dev, *result;
  40
  41         result = 0;
  42         for (dev = all_devices; dev; dev = dev->next) {
  43                 if ((dev->path.type == DEVICE_PATH_PCI) &&
  44                     (dev->bus->secondary == bus) &&
  45                     (dev->path.pci.devfn == devfn)) {
  46                         result = dev;
  47                         break;
  48                 }
  49         }
  50         return result;
  51 }
  52
  53 /**
  54  * Given a device pointer, find the next PCI device.
  55  *
  56  * @param previous_dev A pointer to a PCI device structure.
  57  * @return Pointer to the next device structure (if found), 0 otherwise.
  58  */
  59 ROMSTAGE_CONST struct device *dev_find_next_pci_device(
  60                 ROMSTAGE_CONST struct device *previous_dev)
  61 {
  62         ROMSTAGE_CONST struct device *dev, *result;
  63
  64         if (previous_dev == NULL)
  65                 previous_dev = all_devices;
  66
  67         result = 0;
  68         for (dev = previous_dev->next; dev; dev = dev->next) {
  69                 if (dev->path.type == DEVICE_PATH_PCI) {
  70                         result = dev;
  71                         break;
  72                 }
  73         }
  74         return result;
  75 }
  76
  77 /**
  78  * Given an SMBus bus and a device number, find the device structure.
  79  *
  80  * @param bus The bus number.
  81  * @param addr A device number.
  82  * @return Pointer to the device structure (if found), 0 otherwise.
  83  */
  84 ROMSTAGE_CONST struct device *dev_find_slot_on_smbus(unsigned int bus,
  85                                                         unsigned int addr)
  86 {
  87         ROMSTAGE_CONST struct device *dev, *result;
  88
  89         result = 0;
  90         for (dev = all_devices; dev; dev = dev->next) {
  91                 if ((dev->path.type == DEVICE_PATH_I2C) &&
  92                     (dev->bus->secondary == bus) &&
  93                     (dev->path.i2c.device == addr)) {
  94                         result = dev;
  95                         break;
  96                 }
  97         }
  98         return result;
  99 }
 100
 101 /**
 102  * Given a PnP port and a device number, find the device structure.
 103  *
 104  * @param port The I/O port.
 105  * @param device Logical device number.
 106  * @return Pointer to the device structure (if found), 0 otherwise.
 107  */
 108 ROMSTAGE_CONST struct device *dev_find_slot_pnp(u16 port, u16 device)
 109 {
 110         ROMSTAGE_CONST struct device *dev;
 111
 112         for (dev = all_devices; dev; dev = dev->next) {
 113                 if ((dev->path.type == DEVICE_PATH_PNP) &&
 114                     (dev->path.pnp.port == port) &&
 115                     (dev->path.pnp.device == device)) {
 116                         return dev;
 117                 }
 118         }
 119         return 0;
 120 }