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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-06-02 11:16:22 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-06-02 11:16:22 +0100
commit74facffeca3795ffb5cf8898f5859fbb822e4c5d (patch)
tree6dec7ecd2a2e4a83b7514bab17599bdcb1fe4e90
parent1fa7b6a29c61358cc2ca6f64cef4aa0e1a7ca74c (diff)
ARM: Allow SoCs to enable scatterlist chaining
Allow SoCs to enable the scatterlist chaining support, which allows scatterlist tables to be broken up into smaller allocations. As support for this feature depends on the implementation details of the users of the scatterlists, we can't enable this globally without auditing all the users, which is a very big task. Instead, let SoCs progressively switch over to using this. SoC drivers using scatterlists and SoC DMA implementations need auditing before this option can be enabled for the SoC. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/Kconfig3
-rw-r--r--arch/arm/include/asm/scatterlist.h4
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9adc278a22ab..cc0dcbf1f6b5 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -37,6 +37,9 @@ config ARM
Europe. There is an ARM Linux project with a web page at
<http://www.arm.linux.org.uk/>.
+config ARM_HAS_SG_CHAIN
+ bool
+
config HAVE_PWM
bool
diff --git a/arch/arm/include/asm/scatterlist.h b/arch/arm/include/asm/scatterlist.h
index 2f87870d9347..cefdb8f898a1 100644
--- a/arch/arm/include/asm/scatterlist.h
+++ b/arch/arm/include/asm/scatterlist.h
@@ -1,6 +1,10 @@
#ifndef _ASMARM_SCATTERLIST_H
#define _ASMARM_SCATTERLIST_H
+#ifdef CONFIG_ARM_HAS_SG_CHAIN
+#define ARCH_HAS_SG_CHAIN
+#endif
+
#include <asm/memory.h>
#include <asm/types.h>
#include <asm-generic/scatterlist.h>