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commit193ced4a79upstream. Recent versions of the PCI Express specification have deprecated support for I/O transactions and actually some PCIe host bridges, such as Power Systems Host Bridge 4 (PHB4), do not implement them. The default kernel configuration choice for the defxx driver is the use of I/O ports rather than MMIO for PCI and EISA systems. It may have made sense as a conservative backwards compatible choice back when MMIO operation support was added to the driver as a part of TURBOchannel bus support. However nowadays this configuration choice makes the driver unusable with systems that do not implement I/O transactions for PCIe. Make DEFXX_MMIO the configuration default then, except where configured for EISA. This exception is because an EISA adapter can have its MMIO decoding disabled with ECU (EISA Configuration Utility) and therefore not available with the resource allocation infrastructure we implement, while port I/O is always readily available as it uses slot-specific addressing, directly mapped to the slot an option card has been placed in and handled with our EISA bus support core. Conversely a kernel that supports modern systems which may not have I/O transactions implemented for PCIe will usually not be expected to handle legacy EISA systems. The change of the default will make it easier for people, including but not limited to distribution packagers, to make a working choice for the driver. Update the option description accordingly and while at it replace the potentially ambiguous PIO acronym with IOP for "port I/O" vs "I/O ports" according to our nomenclature used elsewhere. Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk> Fixes:e89a2cfb7d("[TC] defxx: TURBOchannel support") Cc: stable@vger.kernel.org # v2.6.21+ Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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# FDDI network device configuration
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#
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config FDDI
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tristate "FDDI driver support"
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depends on PCI || EISA || TC
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---help---
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Fiber Distributed Data Interface is a high speed local area network
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design; essentially a replacement for high speed Ethernet. FDDI can
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run over copper or fiber. If you are connected to such a network and
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want a driver for the FDDI card in your computer, say Y here (and
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then also Y to the driver for your FDDI card, below). Most people
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will say N.
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if FDDI
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config DEFZA
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tristate "DEC FDDIcontroller 700/700-C (DEFZA-xx) support"
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depends on FDDI && TC
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help
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This is support for the DEC FDDIcontroller 700 (DEFZA-AA, fiber)
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and 700-C (DEFZA-CA, copper) TURBOchannel network cards which
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can connect you to a local FDDI network.
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To compile this driver as a module, choose M here: the module
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will be called defza. If unsure, say N.
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config DEFXX
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tristate "Digital DEFTA/DEFEA/DEFPA adapter support"
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depends on FDDI && (PCI || EISA || TC)
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---help---
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This is support for the DIGITAL series of TURBOchannel (DEFTA),
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EISA (DEFEA) and PCI (DEFPA) controllers which can connect you
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to a local FDDI network.
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To compile this driver as a module, choose M here: the module
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will be called defxx. If unsure, say N.
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config DEFXX_MMIO
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bool
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prompt "Use MMIO instead of IOP" if PCI || EISA
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depends on DEFXX
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default n if EISA
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default y
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---help---
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This instructs the driver to use EISA or PCI memory-mapped I/O
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(MMIO) as appropriate instead of programmed I/O ports (IOP).
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Enabling this gives an improvement in processing time in parts
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of the driver, but it requires a memory window to be configured
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for EISA (DEFEA) adapters that may not always be available.
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Conversely some PCIe host bridges do not support IOP, so MMIO
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may be required to access PCI (DEFPA) adapters on downstream PCI
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buses with some systems. TURBOchannel does not have the concept
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of I/O ports, so MMIO is always used for these (DEFTA) adapters.
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If unsure, say N.
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config SKFP
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tristate "SysKonnect FDDI PCI support"
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depends on FDDI && PCI
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select BITREVERSE
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---help---
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Say Y here if you have a SysKonnect FDDI PCI adapter.
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The following adapters are supported by this driver:
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- SK-5521 (SK-NET FDDI-UP)
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- SK-5522 (SK-NET FDDI-UP DAS)
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- SK-5541 (SK-NET FDDI-FP)
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- SK-5543 (SK-NET FDDI-LP)
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- SK-5544 (SK-NET FDDI-LP DAS)
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- SK-5821 (SK-NET FDDI-UP64)
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- SK-5822 (SK-NET FDDI-UP64 DAS)
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- SK-5841 (SK-NET FDDI-FP64)
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- SK-5843 (SK-NET FDDI-LP64)
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- SK-5844 (SK-NET FDDI-LP64 DAS)
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- Netelligent 100 FDDI DAS Fibre SC
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- Netelligent 100 FDDI SAS Fibre SC
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- Netelligent 100 FDDI DAS UTP
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- Netelligent 100 FDDI SAS UTP
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- Netelligent 100 FDDI SAS Fibre MIC
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Read <file:Documentation/networking/skfp.txt> for information about
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the driver.
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Questions concerning this driver can be addressed to:
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<linux@syskonnect.de>
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To compile this driver as a module, choose M here: the module
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will be called skfp. This is recommended.
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endif # FDDI
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