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authorGregory CLEMENT <gregory.clement@free-electrons.com>2013-11-25 17:26:46 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-12-11 22:36:26 -0800
commit4a06eca7f59d50a532c486a38e14a47316522acb (patch)
tree2c1d92fd7c7199f3232d3014e951cb6697bc2a80 /arch/arm/boot/dts
parent72bb80c9b5e1e55149bbb874db1afdd9abfdccea (diff)
downloadlinux-linaro-stable-4a06eca7f59d50a532c486a38e14a47316522acb.tar.gz
ARM: mvebu: use the virtual CPU registers to access coherency registers
commit b6dda00cddcc71d2030668bc0cc0fed758c411c2 upstream. The Armada XP provides a mechanism called "virtual CPU registers" or "per-CPU register banking", to access the per-CPU registers of the current CPU, without having to worry about finding on which CPU we're running. CPU0 has its registers at 0x21800, CPU1 at 0x21900, CPU2 at 0x21A00 and CPU3 at 0x21B00. The virtual registers accessing the current CPU registers are at 0x21000. However, in the Device Tree node that provides the register addresses for the coherency unit (which is responsible for ensuring coherency between processors, and I/O coherency between processors and the DMA-capable devices), a mistake was made: the CPU0-specific registers were specified instead of the virtual CPU registers. This means that the coherency barrier needed for I/O coherency was not behaving properly when executed from a CPU different from CPU0. This patch fixes that by using the virtual CPU registers. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Fixes: e60304f8cb7bb5 "arm: mvebu: Add hardware I/O Coherency support" Signed-off-by: Jason Cooper <jason@lakedaemon.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/boot/dts')
-rw-r--r--arch/arm/boot/dts/armada-370-xp.dtsi2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/armada-370-xp.dtsi b/arch/arm/boot/dts/armada-370-xp.dtsi
index 550eb772c30e..4d12d2347c15 100644
--- a/arch/arm/boot/dts/armada-370-xp.dtsi
+++ b/arch/arm/boot/dts/armada-370-xp.dtsi
@@ -51,7 +51,7 @@
coherency-fabric@20200 {
compatible = "marvell,coherency-fabric";
- reg = <0x20200 0xb0>, <0x21810 0x1c>;
+ reg = <0x20200 0xb0>, <0x21010 0x1c>;
};
serial@12000 {