[PATCH v5 01/20] ARM: Introduce atomic MMIO modify

[Ezequiel Garcia]

On Mon, Jan 27, 2014 at 12:27:01PM -0300, Ezequiel Garcia wrote:
> Some SoC have MMIO regions that are shared across orthogonal
> subsystems. This commit implements a possible solution for the
> thread-safe access of such regions through a spinlock-protected API.
> 
> Concurrent access is protected with a single spinlock for the
> entire MMIO address space. While this protects shared-registers,
> it also serializes access to unrelated/unshared registers.
> 
> We add relaxed and non-relaxed variants, by using writel_relaxed and writel,
> respectively. The rationale for this is that some users may not require
> register write completion but only thread-safe access to a register.
> 
> Cc: Russell King - ARM Linux <linux at arm.linux.org.uk>
> Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia at free-electrons.com>
> ---
> Russell,
> 
> Can you confirm this patch is on its way to v3.14?
> 

ping?

-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com