drivers/ntb/hw/idt/Kconfig

Source file repositories/reference/linux-study-clean/drivers/ntb/hw/idt/Kconfig

File Facts

System
Linux kernel
Corpus path
drivers/ntb/hw/idt/Kconfig
Extension
[no extension]
Size
1327 bytes
Lines
32
Domain
Driver Families
Bucket
drivers/ntb
Inferred role
Driver Families: build/configuration rule
Status
atlas-only

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

# 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.

Annotation

Implementation Notes