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bus: ixp4xx: Add a driver for IXP4xx expansion bus

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The Intel IXP4xx SoCs have an expansion bus that is usually just
used for flash memory and configured by the boot loaders and can
be accessed using the "simple-bus".

However some devices need more elaborate configuration and then we
need to provide a proper 3-unit address space indicating chip
select for each device and provide timing and similar information.

Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij
2021-07-16 01:53:34 +02:00
parent 3fbcc6763b
commit 1c953bda90
4 changed files with 443 additions and 0 deletions
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11
drivers/bus/Kconfig
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@@ -95,6 +95,17 @@ config IMX_WEIM
The WEIM(Wireless External Interface Module) works like a bus.
You can attach many different devices on it, such as NOR, onenand.
config INTEL_IXP4XX_EB
bool "Intel IXP4xx expansion bus interface driver"
depends on HAS_IOMEM
depends on ARCH_IXP4XX || COMPILE_TEST
default ARCH_IXP4XX
select MFD_SYSCON
help
Driver for the Intel IXP4xx expansion bus interface. The driver is
needed to set up various chip select configuration parameters before
devices on the expansion bus can be discovered.
config MIPS_CDMM
bool "MIPS Common Device Memory Map (CDMM) Driver"
depends on CPU_MIPSR2 || CPU_MIPSR5