diff options
Diffstat (limited to 'drivers/ntb/hw/idt/Kconfig')
| -rw-r--r-- | drivers/ntb/hw/idt/Kconfig | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/ntb/hw/idt/Kconfig b/drivers/ntb/hw/idt/Kconfig new file mode 100644 index 000000000..c79b54c17 --- /dev/null +++ b/drivers/ntb/hw/idt/Kconfig @@ -0,0 +1,31 @@ +# 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. + |