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Diffstat (limited to 'src/device/root_device.c')
| -rw-r--r-- | src/device/root_device.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/device/root_device.c b/src/device/root_device.c new file mode 100644 index 0000000000..8ff2fdeb66 --- /dev/null +++ b/src/device/root_device.c @@ -0,0 +1,166 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2003-2004 Linux Networx + * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx) + * Copyright (C) 2003 Ronald G. Minnich <rminnich@gmail.com> + * Copyright (C) 2004-2005 Li-Ta Lo <ollie@lanl.gov> + * Copyright (C) 2005 Tyan + * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <console/console.h> +#include <device/device.h> +#include <device/pci.h> +#include <reset.h> + +const char mainboard_name[] = CONFIG_MAINBOARD_VENDOR " " CONFIG_MAINBOARD_PART_NUMBER; + +/** + * Read the resources for the root device, that encompass the resources for + * the entire system. + * + * @param root Pointer to the device structure for the system root device. + */ +static void root_dev_read_resources(device_t root) +{ + printk(BIOS_ERR, "%s should never be called.\n", __func__); +} + +/** + * Write the resources for every device. + * + * Write the resources for the root device, and every device under it which + * are all of the devices. + * + * @param root Pointer to the device structure for the system root device. + */ +static void root_dev_set_resources(device_t root) +{ + printk(BIOS_ERR, "%s should never be called.\n", __func__); +} + +/** + * Scan devices on static buses. + * + * The enumeration of certain buses is purely static. The existence of + * devices on those buses can be completely determined at compile time + * and is specified in the config file. Typical examples are the 'PNP' + * devices on a legacy ISA/LPC bus. There is no need of probing of any kind, + * the only thing we have to do is to walk through the bus and + * enable or disable devices as indicated in the config file. + * + * On the other hand, some devices are virtual and their existence is + * artificial. They can not be probed at run time. One example is the + * debug device. Those virtual devices have to be listed in the config + * file under some static bus in order to be enumerated at run time. + * + * This function is the default scan_bus() method for the root device and + * LPC bridges. + * + * @param bus Pointer to the device to which the static buses are attached to. + * @param max Maximum bus number currently used before scanning. + * @return The largest bus number used. + */ +static int smbus_max = 0; +unsigned int scan_static_bus(device_t bus, unsigned int max) +{ + device_t child; + struct bus *link; + + printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus)); + + for (link = bus->link_list; link; link = link->next) { + /* For SMBus bus enumerate. */ + child = link->children; + + if (child && child->path.type == DEVICE_PATH_I2C) + link->secondary = ++smbus_max; + + for (child = link->children; child; child = child->sibling) { + if (child->chip_ops && child->chip_ops->enable_dev) + child->chip_ops->enable_dev(child); + + if (child->ops && child->ops->enable) + child->ops->enable(child); + + if (child->path.type == DEVICE_PATH_I2C) { + printk(BIOS_DEBUG, "smbus: %s[%d]->", + dev_path(child->bus->dev), + child->bus->link_num); + } + printk(BIOS_DEBUG, "%s %s\n", dev_path(child), + child->enabled ? "enabled" : "disabled"); + } + } + + for (link = bus->link_list; link; link = link->next) { + for (child = link->children; child; child = child->sibling) { + if (!child->ops || !child->ops->scan_bus) + continue; + printk(BIOS_SPEW, "%s scanning...\n", dev_path(child)); + max = scan_bus(child, max); + } + } + + printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus)); + + return max; +} + +static void root_dev_enable_resources(device_t dev) +{ +} + +/** + * Scan root bus for generic systems. + * + * This function is the default scan_bus() method of the root device. + * + * @param root The root device structure. + * @param max The current bus number scanned so far, usually 0x00. + * @return The largest bus number used. + */ +static unsigned int root_dev_scan_bus(device_t root, unsigned int max) +{ + return scan_static_bus(root, max); +} + +static void root_dev_init(device_t root) +{ +} + +static void root_dev_reset(struct bus *bus) +{ + printk(BIOS_INFO, "Resetting board...\n"); + hard_reset(); +} + +/** + * Default device operation for root device. + * + * This is the default device operation for root devices. These operations + * should be fully usable as is. However the chip_operations::enable_dev() + * of a motherboard can override this if you want non-default behavior. + */ +struct device_operations default_dev_ops_root = { + .read_resources = root_dev_read_resources, + .set_resources = root_dev_set_resources, + .enable_resources = root_dev_enable_resources, + .init = root_dev_init, + .scan_bus = root_dev_scan_bus, + .reset_bus = root_dev_reset, +}; |