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    • Thomas Petazzoni's avatar
      bus: introduce an Marvell EBU MBus driver · fddddb52
      Thomas Petazzoni authored
      
      
      The Marvell EBU SoCs have a configurable physical address space
      layout: the physical ranges of memory used to address PCI(e)
      interfaces, NOR flashes, SRAM and various other types of memory are
      configurable by software, through a mechanism of so-called 'address
      decoding windows'.
      
      This new driver mvebu-mbus consolidates the existing code to address
      the configuration of these memory ranges, which is spread into
      mach-mvebu, mach-orion5x, mach-mv78xx0, mach-dove and mach-kirkwood.
      
      Following patches convert each Marvell EBU SoC family to use this
      driver, therefore removing the old code that was configuring the
      address decoding windows.
      
      It is worth mentioning that the MVEBU_MBUS Kconfig option is
      intentionally added as a blind option. The new driver implements and
      exports the mv_mbus_dram_info() function, which is used by various
      Marvell drivers throughout the tree to get access to window
      configuration parameters that they require. This function is also
      implemented in arch/arm/plat-orion/addr-map.c, which ultimately gets
      removed at the end of this patch series. So, in order to preserve
      bisectability, we want to ensure that *either* this new driver, *or*
      the legacy code in plat-orion/addr-map.c gets compiled in.
      
      By making MVEBU_MBUS a blind option, we are sure that only a platform
      that does 'select MVEBU_MBUS' will get this new driver compiled
      in. Therefore, throughout the next patches that convert the Marvell
      sub-architectures one after the other to this new driver, we add the
      'select MVEBU_MBUS' and also ensure to remove plat-orion/addr-map.c
      from the build for this specific sub-architecture. This ensures that
      bisectability is preserved.
      
      Ealier versions of this driver had a DT binding, but since those were
      not yet agreed upon, they were removed. The driver still uses
      of_device_id to find the SoC specific details according to the string
      passed to mvebu_mbus_init(). The plan is to re-introduce a proper DT
      binding as a followup set of patches.
      
      Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
      Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
      fddddb52