/* * This file is part of the LinuxBIOS 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 <part/hard_reset.h> /** * 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(device_t root) { struct resource *resource; /* Initialize the system wide io space constraints */ resource = new_resource(root, 0); resource->base = 0x400; resource->size = 0; resource->align = 0; resource->gran = 0; resource->limit = 0xffffUL; resource->flags = IORESOURCE_IO; compute_allocate_resource(&root->link[0], resource, IORESOURCE_IO, IORESOURCE_IO); /* Initialize the system wide memory resources constraints */ resource = new_resource(root, 1); resource->base = 0; resource->size = 0; resource->align = 0; resource->gran = 0; resource->limit = 0xffffffffUL; resource->flags = IORESOURCE_MEM; compute_allocate_resource(&root->link[0], resource, IORESOURCE_MEM, IORESOURCE_MEM); } /** * @brief 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 */ void root_dev_set_resources(device_t root) { struct bus *bus; bus = &root->link[0]; compute_allocate_resource(bus, &root->resource[0], IORESOURCE_IO, IORESOURCE_IO); compute_allocate_resource(bus, &root->resource[1], IORESOURCE_MEM, IORESOURCE_MEM); assign_resources(bus); } /** * @brief 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 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(device_t bus, unsigned int max) { device_t child; unsigned link; printk_spew("%s for %s\n", __func__, dev_path(bus)); for(link = 0; link < bus->links; link++) { /* for smbus bus enumerate */ child = bus->link[link].children; if(child && child->path.type == DEVICE_PATH_I2C) { bus->link[link].secondary = ++smbus_max; } for(child = bus->link[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_debug("smbus: %s[%d]->", dev_path(child->bus->dev), child->bus->link ); } printk_debug("%s %s\n", dev_path(child), child->enabled?"enabled": "disabled"); } } for(link = 0; link < bus->links; link++) { for(child = bus->link[link].children; child; child = child->sibling) { if (!child->ops || !child->ops->scan_bus) continue; printk_spew("%s scanning...\n", dev_path(child)); max = scan_bus(child, max); } } printk_spew("%s for %s done\n", __func__, dev_path(bus)); return max; } /** * @brief Enable resources for children devices * * @param dev the device whos children's resources are to be enabled * * 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() */ void enable_childrens_resources(device_t dev) { unsigned link; for(link = 0; link < dev->links; link++) { device_t child; for(child = dev->link[link].children; child; child = child->sibling) { enable_resources(child); } } } void root_dev_enable_resources(device_t dev) { enable_childrens_resources(dev); } /** * @brief Scan root bus for generic systems * * @param root The root device structure * @param max The current bus number scanned so far, usually 0x00 * * This function is the default scan_bus() method of the root device. */ unsigned int root_dev_scan_bus(device_t root, unsigned int max) { return scan_static_bus(root, max); } void root_dev_init(device_t root) { } void root_dev_reset(struct bus *bus) { printk_info("Reseting board...\n"); hard_reset(); } /** * @brief 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, }; /** * @brief 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;