|# SPDX-License-Identifier: GPL-2.0-only
| tristate "IDT PCIe-switch Non-Transparent Bridge support"
| depends on PCI
| select HWMON
| This driver supports NTB of capable IDT PCIe-switches.
| Some of the pre-initializations must be made before IDT PCIe-switch
| exposes its NT-functions correctly. It should be done by either proper
| initialization of EEPROM connected to master SMbus of the switch or
| by BIOS using slave-SMBus interface changing corresponding registers
| value. Evidently it must be done before PCI bus enumeration is
| finished in Linux kernel.
| First of all partitions must be activated and properly assigned to all
| the ports with NT-functions intended to be activated (see SWPARTxCTL
| and SWPORTxCTL registers). Then all NT-function BARs must be enabled
| with chosen valid aperture. For memory windows related BARs the
| aperture settings shall determine the maximum size of memory windows
| accepted by a BAR. Note that BAR0 must map PCI configuration space
| It's worth to note, that since a part of this driver relies on the
| BAR settings of peer NT-functions, the BAR setups can't be done over
| kernel PCI fixups. That's why the alternative pre-initialization
| techniques like BIOS using SMBus interface or EEPROM should be
| If unsure, say N.