| config NTB_IDT | |
| tristate "IDT PCIe-switch Non-Transparent Bridge support" | |
| depends on PCI | |
| help | |
| This driver supports NTB of cappable IDT PCIe-switches. | |
| Some of the pre-initializations must be made before IDT PCIe-switch | |
| exposes it NT-functions correctly. It should be done by either proper | |
| initialisation 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. Additionally if one needs to have temperature sensor | |
| information printed to system log, the corresponding registers must | |
| be initialized within BIOS/EEPROM as well. | |
| If unsure, say N. | |