src/device/root_device.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 Ronald G. Minnich <rminnich@gmail.com>
   7  * Copyright (C) 2004-2005 Li-Ta Lo <ollie@lanl.gov>
   8  * Copyright (C) 2005 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 <console/console.h>
  22 #include <device/device.h>
  23 #include <device/pci.h>
  24 #include <reset.h>
  25
  26 const char mainboard_name[] = CONFIG_MAINBOARD_VENDOR " " CONFIG_MAINBOARD_PART_NUMBER;
  27
  28 /**
  29  * Scan devices on static buses.
  30  *
  31  * The enumeration of certain buses is purely static. The existence of
  32  * devices on those buses can be completely determined at compile time
  33  * and is specified in the config file. Typical examples are the 'PNP'
  34  * devices on a legacy ISA/LPC bus. There is no need of probing of any kind,
  35  * the only thing we have to do is to walk through the bus and
  36  * enable or disable devices as indicated in the config file.
  37  *
  38  * On the other hand, some devices are virtual and their existence is
  39  * artificial. They can not be probed at run time. One example is the
  40  * debug device. Those virtual devices have to be listed in the config
  41  * file under some static bus in order to be enumerated at run time.
  42  *
  43  * @param bus Pointer to the device to which the static buses are attached to.
  44  */
  45
  46 static void scan_static_bus(device_t bus)
  47 {
  48         device_t child;
  49         struct bus *link;
  50
  51         for (link = bus->link_list; link; link = link->next) {
  52                 for (child = link->children; child; child = child->sibling) {
  53
  54                         if (child->chip_ops && child->chip_ops->enable_dev)
  55                                 child->chip_ops->enable_dev(child);
  56
  57                         if (child->ops && child->ops->enable)
  58                                 child->ops->enable(child);
  59
  60                         printk(BIOS_DEBUG, "%s %s\n", dev_path(child),
  61                                child->enabled ? "enabled" : "disabled");
  62                 }
  63         }
  64 }
  65
  66 void scan_lpc_bus(device_t bus)
  67 {
  68         printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
  69
  70         scan_static_bus(bus);
  71
  72         printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
  73 }
  74
  75 void scan_smbus(device_t bus)
  76 {
  77         device_t child;
  78         struct bus *link;
  79         static int smbus_max = 0;
  80
  81         printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
  82
  83         for (link = bus->link_list; link; link = link->next) {
  84
  85                 link->secondary = ++smbus_max;
  86
  87                 for (child = link->children; child; child = child->sibling) {
  88
  89                         if (child->chip_ops && child->chip_ops->enable_dev)
  90                                 child->chip_ops->enable_dev(child);
  91
  92                         if (child->ops && child->ops->enable)
  93                                 child->ops->enable(child);
  94
  95                         printk(BIOS_DEBUG, "smbus: %s[%d]->", dev_path(child->bus->dev),
  96                                child->bus->link_num);
  97
  98                         printk(BIOS_DEBUG, "%s %s\n", dev_path(child),
  99                                child->enabled ? "enabled" : "disabled");
 100                 }
 101         }
 102
 103         printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
 104 }
 105
 106 /**
 107  * Scan root bus for generic systems.
 108  *
 109  * This function is the default scan_bus() method of the root device.
 110  *
 111  * @param root The root device structure.
 112  */
 113 static void root_dev_scan_bus(device_t bus)
 114 {
 115         struct bus *link;
 116
 117         printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
 118
 119         scan_static_bus(bus);
 120
 121         for (link = bus->link_list; link; link = link->next)
 122                 scan_bridges(link);
 123
 124         printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
 125 }
 126
 127 static void root_dev_reset(struct bus *bus)
 128 {
 129         printk(BIOS_INFO, "Resetting board...\n");
 130         hard_reset();
 131 }
 132
 133 /**
 134  * Default device operation for root device.
 135  *
 136  * This is the default device operation for root devices. These operations
 137  * should be fully usable as is. However the chip_operations::enable_dev()
 138  * of a motherboard can override this if you want non-default behavior.
 139  */
 140 struct device_operations default_dev_ops_root = {
 141         .read_resources   = DEVICE_NOOP,
 142         .set_resources    = DEVICE_NOOP,
 143         .enable_resources = DEVICE_NOOP,
 144         .init             = DEVICE_NOOP,
 145         .scan_bus         = root_dev_scan_bus,
 146         .reset_bus        = root_dev_reset,
 147 };