linux-kernel - [PATCH v2 1/9] arm: mvebu: Limit the DMA zone when LPAE is selected

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Message-Id: <1365193444-13441-2-git-send-email-gregory.clement@free-electrons.com>
Date:	Fri,  5 Apr 2013 22:23:56 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Nicolas Pitre <nico@...xnic.net>,
	Lior Amsalem <alior@...vell.com>,
	Maen Suleiman <maen@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Ike Pan <ike.pan@...onical.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Jon Masters <jcm@...hat.com>,
	David Marlin <dmarlin@...hat.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: [PATCH v2 1/9] arm: mvebu: Limit the DMA zone when LPAE is selected

When LPAE is activated on Armada XP, all registers and IOs are still
32bit, the 40bit extension is on the CPU to DRAM path (windows) only.
That means that all the DMA transfer are restricted to the low 32 bits
address space. This is limitation is achieved by selecting ZONE_DMA.

Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
---
 arch/arm/mach-mvebu/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index 440b13e..db1bbc8 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -13,6 +13,7 @@ config ARCH_MVEBU
 	select MVEBU_CLK_CORE
 	select MVEBU_CLK_CPU
 	select MVEBU_CLK_GATING
+	select ZONE_DMA if ARM_LPAE
 
 if ARCH_MVEBU
 
-- 
1.7.9.5

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