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dma-mapping: detect and configure IOMMU in of_dma_configure 

This patch extends of_dma_configure so that it sets up the IOMMU for a
device, as well as the coherent/non-coherent DMA mapping ops.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2014-08-27 16:24:20 +01:00
parent 461bfb3fe7
commit 97890ba928
3 changed files with 24 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/include/asm/dma-mapping.h
View File

@ -121,7 +121,9 @@ static inline unsigned long dma_max_pfn(struct device *dev)
}
#define dma_max_pfn(dev) dma_max_pfn(dev)
static inline void arch_setup_dma_ops(struct device *dev, bool coherent)
static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
u64 size, struct iommu_ops *iommu,
bool coherent)
{
if (coherent)
set_dma_ops(dev, &arm_coherent_dma_ops);

21
drivers/of/platform.c
View File

@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_iommu.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
@ -166,6 +167,7 @@ static void of_dma_configure(struct device *dev)
int ret;
bool coherent;
unsigned long offset;
struct iommu_ops *iommu;
/*
* Set default dma-mask to 32 bit. Drivers are expected to setup
@ -194,7 +196,16 @@ static void of_dma_configure(struct device *dev)
dev_dbg(dev, "device is%sdma coherent\n",
coherent ? " " : " not ");
arch_setup_dma_ops(dev, coherent);
iommu = of_iommu_configure(dev);
dev_dbg(dev, "device is%sbehind an iommu\n",
iommu ? " " : " not ");
arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
}
static void of_dma_deconfigure(struct device *dev)
{
arch_teardown_dma_ops(dev);
}
/**
@ -223,16 +234,12 @@ static struct platform_device *of_platform_device_create_pdata(
if (!dev)
goto err_clear_flag;
of_dma_configure(&dev->dev);
dev->dev.bus = &platform_bus_type;
dev->dev.platform_data = platform_data;
/* We do not fill the DMA ops for platform devices by default.
* This is currently the responsibility of the platform code
* to do such, possibly using a device notifier
*/
of_dma_configure(&dev->dev);
if (of_device_add(dev) != 0) {
of_dma_deconfigure(&dev->dev);
platform_device_put(dev);
goto err_clear_flag;
}

8
include/linux/dma-mapping.h
View File

@ -130,7 +130,13 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
extern u64 dma_get_required_mask(struct device *dev);
#ifndef arch_setup_dma_ops
static inline void arch_setup_dma_ops(struct device *dev, bool coherent) { }
static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
u64 size, struct iommu_ops *iommu,
bool coherent) { }
#endif
#ifndef arch_teardown_dma_ops
static inline void arch_teardown_dma_ops(struct device *dev) { }
#endif
static inline unsigned int dma_get_max_seg_size(struct device *dev)