| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #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; |
| |
| /** |
| * Enable 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. |
| * |
| * @param bus Pointer to the device to which the static buses are attached to. |
| */ |
| |
| void enable_static_devices(struct device *bus) |
| { |
| struct device *child; |
| struct bus *link; |
| |
| for (link = bus->link_list; link; link = link->next) { |
| 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); |
| |
| printk(BIOS_DEBUG, "%s %s\n", dev_path(child), |
| child->enabled ? "enabled" : "disabled"); |
| } |
| } |
| } |
| |
| void scan_generic_bus(struct device *bus) |
| { |
| struct device *child; |
| struct bus *link; |
| static int bus_max = 0; |
| |
| printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus)); |
| |
| for (link = bus->link_list; link; link = link->next) { |
| |
| link->secondary = ++bus_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); |
| |
| printk(BIOS_DEBUG, "bus: %s[%d]->", dev_path(child->bus->dev), |
| child->bus->link_num); |
| |
| printk(BIOS_DEBUG, "%s %s\n", dev_path(child), |
| child->enabled ? "enabled" : "disabled"); |
| } |
| } |
| |
| printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus)); |
| } |
| |
| void scan_smbus(struct device *bus) |
| { |
| scan_generic_bus(bus); |
| } |
| |
| /* |
| * Default scan_bus() implementation |
| * |
| * This is the default implementation for buses that can't |
| * be probed at runtime. It simply walks through the topology |
| * given by the mainboard's `devicetree.cb`. |
| * |
| * First, all direct descendants of the given device are |
| * enabled. Then, downstream buses are scanned. |
| */ |
| void scan_static_bus(struct device *bus) |
| { |
| struct bus *link; |
| |
| printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus)); |
| |
| enable_static_devices(bus); |
| |
| for (link = bus->link_list; link; link = link->next) |
| scan_bridges(link); |
| |
| printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus)); |
| } |
| |
| static void root_dev_reset(struct bus *bus) |
| { |
| printk(BIOS_INFO, "Resetting board...\n"); |
| board_reset(); |
| } |
| |
| #if CONFIG(HAVE_ACPI_TABLES) |
| static const char *root_dev_acpi_name(const struct device *dev) |
| { |
| return "\\_SB"; |
| } |
| #endif |
| |
| /** |
| * 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 = noop_read_resources, |
| .set_resources = noop_set_resources, |
| .scan_bus = scan_static_bus, |
| .reset_bus = root_dev_reset, |
| #if CONFIG(HAVE_ACPI_TABLES) |
| .acpi_name = root_dev_acpi_name, |
| #endif |
| }; |