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authorMichal Simek <monstr@monstr.eu>2010-01-14 11:21:02 +0100
committerMichal Simek <monstr@monstr.eu>2010-03-11 13:56:29 +0100
commitccfe27d7000668b02d10fc3e06aa49e3e3603162 (patch)
treed8d624f6bd9aebf6a848f9762b0d8ed62ee2c5a6 /arch/microblaze/kernel/setup.c
parent522dba7134d6b2e5821d3457f7941ec34f668e6d (diff)
downloadop-kernel-dev-ccfe27d7000668b02d10fc3e06aa49e3e3603162.zip
op-kernel-dev-ccfe27d7000668b02d10fc3e06aa49e3e3603162.tar.gz
microblaze: Support DMA
Add DMA support for Microblaze. There are some part of this new feature: 1. Basic DMA support 2. Enable DMA debug option 3. Setup notifier Ad 1. dma-mapping come from powerpc and x86 version and it is based on generic dma-mapping-common.h Ad 2. DMA support debug features which is used in generic file. For more information please look at Documentation/DMA-API.txt Ad 3. notifier is very important to setup dma_ops. Without this part for example ll_temac driver failed because there are no setup dma operations. Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/setup.c')
-rw-r--r--arch/microblaze/kernel/setup.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c
index bb8c4b9..bc325ac 100644
--- a/arch/microblaze/kernel/setup.c
+++ b/arch/microblaze/kernel/setup.c
@@ -23,6 +23,8 @@
#include <linux/bug.h>
#include <linux/param.h>
#include <linux/cache.h>
+#include <linux/of_platform.h>
+#include <linux/dma-mapping.h>
#include <asm/cacheflush.h>
#include <asm/entry.h>
#include <asm/cpuinfo.h>
@@ -188,3 +190,37 @@ static int microblaze_debugfs_init(void)
}
arch_initcall(microblaze_debugfs_init);
#endif
+
+static int dflt_bus_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+
+ /* We are only intereted in device addition */
+ if (action != BUS_NOTIFY_ADD_DEVICE)
+ return 0;
+
+ set_dma_ops(dev, &dma_direct_ops);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block dflt_plat_bus_notifier = {
+ .notifier_call = dflt_bus_notify,
+ .priority = INT_MAX,
+};
+
+static struct notifier_block dflt_of_bus_notifier = {
+ .notifier_call = dflt_bus_notify,
+ .priority = INT_MAX,
+};
+
+static int __init setup_bus_notifier(void)
+{
+ bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
+ bus_register_notifier(&of_platform_bus_type, &dflt_of_bus_notifier);
+
+ return 0;
+}
+
+arch_initcall(setup_bus_notifier);
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