/* * This file is part of the coreboot project. * * Copyright (C) 2003-2004 Linux Networx * (Written by Eric Biederman for Linux Networx) * Copyright (C) 2003 Ronald G. Minnich * Copyright (C) 2004-2005 Li-Ta Lo * Copyright (C) 2005 Tyan * (Written by Yinghai Lu 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 #include #include // #include /** * 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. */ void root_dev_read_resources(struct device *root) { printk(BIOS_DEBUG, "This shouldn't be called!\n"); } /** * 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. */ void root_dev_set_resources(struct device *root) { printk(BIOS_DEBUG, "This shouldn't be called!\n"); } /** * 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 busdevice Pointer to the device structure which the static * buses are attached. * @param max Maximum bus number currently used before scanning. * @return Largest bus number used. */ static int smbus_max = 0; unsigned int scan_static_bus(struct device *busdevice, unsigned int max) { struct device *child; unsigned int link; printk(BIOS_INFO, "%s for %s (%s)\n", __func__, busdevice->dtsname, dev_path(busdevice)); for (link = 0; link < busdevice->links; link++) { /* For smbus bus enumerate. */ child = busdevice->link[link].children; if (child && child->path.type == DEVICE_PATH_I2C) { busdevice->link[link].secondary = ++smbus_max; } for (child = busdevice->link[link].children; child; child = child->sibling) { if (child->ops && child->ops->phase3_chip_setup_dev) { child->ops->phase3_chip_setup_dev(child); } /* Sigh. Have to enable to scan... */ if (child->ops && child->ops->phase3_enable) { child->ops->phase3_enable(child); } if (child->path.type == DEVICE_PATH_I2C) { printk(BIOS_DEBUG, "smbus: %s(%s)[%d]->", child->dtsname, dev_path(child->bus->dev), child->bus->link); } printk(BIOS_DEBUG, "%s(%s) %s\n", child->dtsname, dev_path(child), child->enabled ? "enabled" : "disabled"); } } for (link = 0; link < busdevice->links; link++) { for (child = busdevice->link[link].children; child; child = child->sibling) { if (!child->ops || !child->ops->phase3_scan) continue; printk(BIOS_INFO, "%s(%s) scanning...\n", child->dtsname, dev_path(child)); max = dev_phase3_scan(child, max); } } printk(BIOS_INFO, "%s for %s(%s) done\n", __func__, busdevice->dtsname, dev_path(busdevice)); return max; } /** * Enable resources for children devices. * * This function is called by the global enable_resource() indirectly via the * device_operation::enable_resources() method of devices. * * Indirect mutual recursion: * enable_childrens_resources() -> enable_resources() * enable_resources() -> device_operation::enable_resources() * device_operation::enable_resources() -> enable_children_resources() * * @param dev The device whose children's resources are to be enabled. */ void enable_childrens_resources(struct device *dev) { unsigned int link; for (link = 0; link < dev->links; link++) { struct device *child; for (child = dev->link[link].children; child; child = child->sibling) { dev_phase5(child); } } } void root_dev_enable_resources(struct device *dev) { enable_childrens_resources(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 TODO */ unsigned int root_dev_scan_bus(struct device *root, unsigned int max) { return scan_static_bus(root, max); } void root_dev_init(struct device *root) { } void root_dev_reset(struct bus *bus) { printk(BIOS_INFO, "Resetting board... NOT! Define hard_reset please\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. If you need something else, set up your * own ops in (e.g.) the mainboard, and initialize it in the dts in the * mainboard directory. */ struct device_operations default_dev_ops_root = { .id = {.type = DEVICE_ID_ROOT}, .phase3_scan = root_dev_scan_bus, .phase4_read_resources = root_dev_read_resources, .phase4_set_resources = root_dev_set_resources, .phase5_enable_resources = root_dev_enable_resources, .phase6_init = root_dev_init, .reset_bus = root_dev_reset, }; /** * The root of device tree. * * This is the root of the device tree. The device tree is defined in the * static.c file and is generated by config tool during compile time. */ extern struct device dev_root;