3e4a14e153
The work done by enable_static_devices() and scan_generic_bus() is common and can be used by other device handlers to enable a single static device. Signed-off-by: Duncan Laurie <dlaurie@google.com> Change-Id: Ibfde9c4eb794714ebd9800e52b91169ceba15266 Reviewed-on: https://review.coreboot.org/c/coreboot/+/46541 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <console/console.h>
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#include <device/device.h>
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#include <device/pci.h>
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#include <reset.h>
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const char mainboard_name[] = CONFIG_MAINBOARD_VENDOR " " CONFIG_MAINBOARD_PART_NUMBER;
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void enable_static_device(struct device *dev)
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{
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if (dev->chip_ops && dev->chip_ops->enable_dev)
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dev->chip_ops->enable_dev(dev);
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if (dev->ops && dev->ops->enable)
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dev->ops->enable(dev);
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printk(BIOS_DEBUG, "%s %s\n", dev_path(dev),
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dev->enabled ? "enabled" : "disabled");
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}
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/**
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* Enable devices on static buses.
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*
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* The enumeration of certain buses is purely static. The existence of
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* devices on those buses can be completely determined at compile time
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* and is specified in the config file. Typical examples are the 'PNP'
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* devices on a legacy ISA/LPC bus. There is no need of probing of any kind,
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* the only thing we have to do is to walk through the bus and
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* enable or disable devices as indicated in the config file.
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*
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* On the other hand, some devices are virtual and their existence is
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* artificial. They can not be probed at run time. One example is the
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* debug device. Those virtual devices have to be listed in the config
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* file under some static bus in order to be enumerated at run time.
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*
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* @param bus Pointer to the device to which the static buses are attached to.
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*/
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void enable_static_devices(struct device *bus)
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{
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struct device *child;
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struct bus *link;
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for (link = bus->link_list; link; link = link->next) {
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for (child = link->children; child; child = child->sibling) {
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enable_static_device(child);
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}
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}
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}
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void scan_generic_bus(struct device *bus)
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{
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struct device *child;
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struct bus *link;
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static int bus_max = 0;
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printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
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for (link = bus->link_list; link; link = link->next) {
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link->secondary = ++bus_max;
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for (child = link->children; child; child = child->sibling) {
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enable_static_device(child);
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printk(BIOS_DEBUG, "bus: %s[%d]->", dev_path(child->bus->dev),
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child->bus->link_num);
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}
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}
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printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
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}
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void scan_smbus(struct device *bus)
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{
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scan_generic_bus(bus);
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}
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/*
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* Default scan_bus() implementation
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*
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* This is the default implementation for buses that can't
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* be probed at runtime. It simply walks through the topology
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* given by the mainboard's `devicetree.cb`.
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*
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* First, all direct descendants of the given device are
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* enabled. Then, downstream buses are scanned.
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*/
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void scan_static_bus(struct device *bus)
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{
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struct bus *link;
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printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
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enable_static_devices(bus);
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for (link = bus->link_list; link; link = link->next)
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scan_bridges(link);
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printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
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}
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static void root_dev_reset(struct bus *bus)
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{
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printk(BIOS_INFO, "Resetting board...\n");
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board_reset();
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}
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#if CONFIG(HAVE_ACPI_TABLES)
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static const char *root_dev_acpi_name(const struct device *dev)
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{
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return "\\_SB";
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}
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#endif
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/**
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* Default device operation for root device.
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*
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* This is the default device operation for root devices. These operations
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* should be fully usable as is. However the chip_operations::enable_dev()
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* of a motherboard can override this if you want non-default behavior.
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*/
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struct device_operations default_dev_ops_root = {
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.read_resources = noop_read_resources,
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.set_resources = noop_set_resources,
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.scan_bus = scan_static_bus,
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.reset_bus = root_dev_reset,
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#if CONFIG(HAVE_ACPI_TABLES)
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.acpi_name = root_dev_acpi_name,
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#endif
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};
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