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- # SPDX-License-Identifier: GPL-2.0-only
- config NTB_IDT
- tristate "IDT PCIe-switch Non-Transparent Bridge support"
- depends on PCI
- select HWMON
- help
- 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
- registers.
- 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
- utilized.
- If unsure, say N.
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