linux-kernel - [PATCH 09/29] ARM: dma-mapping: provide stubs if no ARM_DMA_USE

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Date:	Tue, 05 Aug 2014 12:47:37 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	iommu@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linaro-mm-sig@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>,
	Cho KyongHo <pullip.cho@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Thierry Reding <treding@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Inki Dae <inki.dae@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 09/29] ARM: dma-mapping: provide stubs if no ARM_DMA_USE_IOMMU
 has been selected

This patch provides stubs returing errors for all iommu related arm
dma-mapping functions, which are used when CONFIG_ARM_DMA_USE_IOMMU is
not set. This let drivers to use common code for iommu and non-iommu
cases without additional ifdefs.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 arch/arm/include/asm/dma-iommu.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
index ae3dac0..1e57569 100644
--- a/arch/arm/include/asm/dma-iommu.h
+++ b/arch/arm/include/asm/dma-iommu.h
@@ -9,6 +9,8 @@
 #include <linux/kmemcheck.h>
 #include <linux/kref.h>
 
+#ifdef CONFIG_ARM_DMA_USE_IOMMU
+
 struct dma_iommu_mapping {
 	/* iommu specific data */
 	struct iommu_domain	*domain;
@@ -38,5 +40,34 @@ int arm_iommu_create_default_mapping(struct device *dev, dma_addr_t base,
 
 void arm_iommu_release_default_mapping(struct device *dev);
 
+#else
+
+static inline struct dma_iommu_mapping *
+arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline void
+arm_iommu_release_mapping(struct dma_iommu_mapping *mapping) { }
+
+static inline int arm_iommu_attach_device(struct device *dev,
+					struct dma_iommu_mapping *mapping)
+{
+	return -ENOSYS;
+}
+
+static inline void arm_iommu_detach_device(struct device *dev) { }
+
+static inline int arm_iommu_create_default_mapping(struct device *dev,
+						dma_addr_t base, size_t size)
+{
+	return -ENOSYS;
+}
+
+static inline void arm_iommu_release_default_mapping(struct device *dev) { }
+
+#endif
+
 #endif /* __KERNEL__ */
 #endif
-- 
1.9.2

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