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| author | Paul Burton <paul.burton@imgtec.com> | 2016-05-17 07:43:24 +0100 |
|---|---|---|
| committer | Daniel Schwierzeck <daniel.schwierzeck@gmail.com> | 2016-05-25 23:13:09 +0200 |
| commit | 0a222d53d81cbd4f7a440a6f83e243a7b4e80544 (patch) | |
| tree | 0821799702e6caf6c49af26614d4310eb0f623b3 /drivers/core | |
| parent | fc15b9beed05dec6cc092c265042381a0eadb0e9 (diff) | |
| download | blackbird-obmc-uboot-0a222d53d81cbd4f7a440a6f83e243a7b4e80544.tar.gz blackbird-obmc-uboot-0a222d53d81cbd4f7a440a6f83e243a7b4e80544.zip | |
fdt: Support for ISA busses
Support ISA busses in much the same way as Linux does. This allows for
ISA bus addresses to be translated, and only if CONFIG_OF_ISA_BUS is
selected in order to avoid including the code in builds which won't need
it.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/core')
| -rw-r--r-- | drivers/core/Kconfig | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig index c5c9d2a42e..87495614c2 100644 --- a/drivers/core/Kconfig +++ b/drivers/core/Kconfig @@ -178,4 +178,27 @@ config SPL_OF_TRANSLATE used for the address translation. This function is faster and smaller in size than fdt_translate_address(). +config OF_ISA_BUS + bool + depends on OF_TRANSLATE + help + Is this option is enabled then support for the ISA bus will + be included for addresses read from DT. This is something that + should be known to be required or not based upon the board + being targetted, and whether or not it makes use of an ISA bus. + + The bus is matched based upon its node name equalling "isa". The + busses #address-cells should equal 2, with the first cell being + used to hold flags & flag 0x1 indicating that the address range + should be accessed using I/O port in/out accessors. The second + cell holds the offset into ISA bus address space. The #size-cells + property should equal 1, and of course holds the size of the + address range used by a device. + + If this option is not enabled then support for the ISA bus is + not included and any such busses used in DT will be treated as + typical simple-bus compatible busses. This will lead to + mistranslation of device addresses, so ensure that this is + enabled if your board does include an ISA bus. + endmenu |
