[PATCH 2/2] powerpc: add support for MPIC message register API

[Kumar Gala]

On Feb 16, 2012, at 8:49 PM, Jia Hongtao wrote:

> Some MPIC implementations contain one or more blocks of message registers
> that are used to send messages between cores via IPIs.  A simple API has
> been added to access (get/put, read, write, etc ...) these message registers.
> The available message registers are initially discovered via nodes in the
> device tree.  A separate commit contains a binding for the message register
> nodes.
> 
> Signed-off-by: Meador Inge <meador_inge at mentor.com>
> Signed-off-by: Jia Hongtao <B38951 at freescale.com>
> Signed-off-by: Li Yang <leoli at freescale.com>
> ---
> This patch is an update for : http://patchwork.ozlabs.org/patch/98075/
> 
> Meador Inge addressed the following points from Ben's feedback:
> * Drop the 'mpic_msgr.msr' field.
> * Drop the 'mpic_msgr.mer' field in favor of address arithmetic off of  'mpic_msgr.addr'.
> * Document the API.
> * Disable MPIC register in 'mpic_msgr_put'.
> * Put locking in 'mpic_msgr_disable'.
> * s/EXPORT_SYMBOL/EXPORT_SYMBOL_GPL/g.
> * Make 'mpic_msgr_write' and 'mpic_msgr_read' 'static inline'.
> 
> I just fixed the checkpatch errors and addressed the following item:
> * In 'mpic_msgr_set_destination' have a wrapper that goes from Linux
>  CPU number to HW CPU number.
> 
> arch/powerpc/include/asm/mpic_msgr.h |  132 ++++++++++++++++
> arch/powerpc/platforms/Kconfig       |    8 +
> arch/powerpc/sysdev/Makefile         |    2 +
> arch/powerpc/sysdev/mpic_msgr.c      |  282 ++++++++++++++++++++++++++++++++++
> 4 files changed, 424 insertions(+), 0 deletions(-)
> create mode 100644 arch/powerpc/include/asm/mpic_msgr.h
> create mode 100644 arch/powerpc/sysdev/mpic_msgr.c

applied

- k