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IDT 89HPESxNTx device series is PCIe-switches, which support Non-Transparent bridging between domains connected to the device ports. Since new NTB API exposes multi-port interface and messaging API, the IDT NT-functions can be now supported in the kernel. This driver adds the following functionality: 1) Multi-port NTB API to have information of possible NT-functions activated in compliance with available device ports. 2) Memory windows of direct and look up table based address translation with all possible combinations of BARs setup. 3) Traditional doorbell NTB API. 4) One-on-one messaging NTB API. There are some IDT PCIe-switch setups, which must be done before any of the NTB peers started. It can be performed either by system BIOS via IDT SMBus-slave interface or by pre-initialized IDT PCIe-switch EEPROM: 1) NT-functions of corresponding ports must be activated using SWPARTxCTL and SWPORTxCTL registers. 2) BAR0 must be configured to expose NT-function configuration registers map. 3) The rest of the BARs must have at least one memory window configured, otherwise the driver will just return an error. Temperature sensor of IDT PCIe-switches can be also optionally activated by BIOS or EEPROM. (See IDT documentations for details of how the pre-initialization can be done) Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Acked-by: Allen Hubbe <Allen.Hubbe@dell.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> |
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