From: Santosh Shilimkar <santosh.shilimkar@ti.com>
Date: Mon, 28 Mar 2011 13:57:46 +0000 (+0530)
Subject: ARM: GIC: Convert GIC library to use the IO relaxed operations
X-Git-Tag: v3.0-rc1~328^2^2~7^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ac77e469e991e9dd91b28e503fa24b5609eedba;p=pandora-kernel.git

ARM: GIC: Convert GIC library to use the IO relaxed operations

The GIC register accesses today make use of readl()/writel()
which prove to be very expensive when used along with mandatory
barriers. This mandatory barriers also introduces an un-necessary
and expensive l2x0_sync() operation. On Cortex-A9 MP cores, GIC
IO accesses from CPU are direct and doesn't go through L2X0 write
buffer.

A DSB before writel_relaxed() in gic_raise_softirq() is added to be
compliant with the Barrier Litmus document - the mailbox scenario.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
---

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