summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorDmitry Baryshkov <dbaryshkov@gmail.com>2008-07-18 13:30:14 +0400
committerIngo Molnar <mingo@elte.hu>2008-07-18 21:14:01 +0200
commit1fe532685a1984dc9f2603ed20bd5e630ba79709 (patch)
treedfae117e13e895bc7cf46a09a969f226e59991f4
parent538c29d43ebdac2edcef96ac07982d2296a63077 (diff)
downloadop-kernel-dev-1fe532685a1984dc9f2603ed20bd5e630ba79709.zip
op-kernel-dev-1fe532685a1984dc9f2603ed20bd5e630ba79709.tar.gz
ARM: support generic per-device coherent dma mem
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/arm/Kconfig1
-rw-r--r--arch/arm/mm/consistent.c8
-rw-r--r--include/asm-arm/dma-mapping.h2
3 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c7ad324..ea8b9be 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -16,6 +16,7 @@ config ARM
select HAVE_KRETPROBES if (HAVE_KPROBES)
select HAVE_FTRACE if (!XIP_KERNEL)
select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE)
+ select HAVE_GENERIC_DMA_COHERENT
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index 333a82a..db7b3e3 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -274,6 +274,11 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
void *
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
{
+ void *memory;
+
+ if (dma_alloc_from_coherent(dev, size, handle, &memory))
+ return memory;
+
if (arch_is_coherent()) {
void *virt;
@@ -362,6 +367,9 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
WARN_ON(irqs_disabled());
+ if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
+ return;
+
if (arch_is_coherent()) {
kfree(cpu_addr);
return;
diff --git a/include/asm-arm/dma-mapping.h b/include/asm-arm/dma-mapping.h
index e99406a..943f23b 100644
--- a/include/asm-arm/dma-mapping.h
+++ b/include/asm-arm/dma-mapping.h
@@ -7,6 +7,8 @@
#include <linux/scatterlist.h>
+#include <asm-generic/dma-coherent.h>
+
/*
* DMA-consistent mapping functions. These allocate/free a region of
* uncached, unwrite-buffered mapped memory space for use with DMA
OpenPOWER on IntegriCloud