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isa: Allow ISA-style drivers on modern systems

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Several modern devices, such as PC/104 cards, are expected to run on
modern systems via an ISA bus interface. Since ISA is a legacy interface
for most modern architectures, ISA support should remain disabled in
general. Support for ISA-style drivers should be enabled on a per driver
basis.

To allow ISA-style drivers on modern systems, this patch introduces the
ISA_BUS_API and ISA_BUS Kconfig options. The ISA bus driver will now
build conditionally on the ISA_BUS_API Kconfig option, which defaults to
the legacy ISA Kconfig option. The ISA_BUS Kconfig option allows the
ISA_BUS_API Kconfig option to be selected on architectures which do not
enable ISA (e.g. X86_64).

The ISA_BUS Kconfig option is currently only implemented for X86
architectures. Other architectures may have their own ISA_BUS Kconfig
options added as required.

Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: William Breathitt Gray <[email protected]>
Acked-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
William Breathitt Gray 2016-05-27 18:08:27 -04:00 • committed by Greg Kroah-Hartman
commit 3a4955111a
4 changed files with 14 additions and 2 deletions
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3
arch/Kconfig
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@ -606,6 +606,9 @@ config HAVE_ARCH_HASH
file which provides platform-specific implementations of some
functions in <linux/hash.h> or fs/namei.c.
config ISA_BUS_API
def_bool ISA
#
# ABI hall of shame
#