2 tristate "IDT PCIe-switch Non-Transparent Bridge support"
6 This driver supports NTB of cappable IDT PCIe-switches.
8 Some of the pre-initializations must be made before IDT PCIe-switch
9 exposes it NT-functions correctly. It should be done by either proper
10 initialisation of EEPROM connected to master smbus of the switch or
11 by BIOS using slave-SMBus interface changing corresponding registers
12 value. Evidently it must be done before PCI bus enumeration is
13 finished in Linux kernel.
15 First of all partitions must be activated and properly assigned to all
16 the ports with NT-functions intended to be activated (see SWPARTxCTL
17 and SWPORTxCTL registers). Then all NT-function BARs must be enabled
18 with chosen valid aperture. For memory windows related BARs the
19 aperture settings shall determine the maximum size of memory windows
20 accepted by a BAR. Note that BAR0 must map PCI configuration space
23 It's worth to note, that since a part of this driver relies on the
24 BAR settings of peer NT-functions, the BAR setups can't be done over
25 kernel PCI fixups. That's why the alternative pre-initialization
26 techniques like BIOS using SMBus interface or EEPROM should be