/* SPDX-License-Identifier: GPL-2.0-only */ #include <console/console.h> #include <device/device.h> #include <device/pci.h> #include <reset.h> void enable_static_device(struct device *dev) { if (dev->chip_ops && dev->chip_ops->enable_dev) dev->chip_ops->enable_dev(dev); if (dev->ops && dev->ops->enable) dev->ops->enable(dev); printk(BIOS_DEBUG, "%s %s\n", dev_path(dev), dev->enabled ? "enabled" : "disabled"); } /** * 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; if (!bus->downstream) return; for (child = bus->downstream->children; child; child = child->sibling) enable_static_device(child); } void scan_generic_bus(struct device *bus) { struct device *child; static int bus_max = 0; printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus)); if (bus->downstream) { bus->downstream->secondary = ++bus_max; for (child = bus->downstream->children; child; child = child->sibling) { enable_static_device(child); printk(BIOS_DEBUG, "bus: %s->", dev_path(child->upstream->dev)); } } 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) { printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus)); enable_static_devices(bus); if (bus->downstream) scan_bridges(bus->downstream); 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 };