ARM: dma-mapping: Add maximum alignment order for dma iommu buffers

	select ARM_HAS_SG_CHAIN

	select NEED_SG_DMA_LENGTH

if ARM_DMA_USE_IOMMU

config ARM_DMA_IOMMU_ALIGNMENT

	int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"

	range 4 9

	default 8

	help

	  DMA mapping framework by default aligns all buffers to the smallest

	  PAGE_SIZE order which is greater than or equal to the requested buffer

	  size. This works well for buffers up to a few hundreds kilobytes, but

	  for larger buffers it just a waste of address space. Drivers which has

	  relatively small addressing window (like 64Mib) might run out of

	  virtual space with just a few allocations.

	  With this parameter you can specify the maximum PAGE_SIZE order for

	  DMA IOMMU buffers. Larger buffers will be aligned only to this

	  specified order. The order is expressed as a power of two multiplied

	  by the PAGE_SIZE.

endif

config HAVE_PWM

	bool

	unsigned int count, start;

	unsigned long flags;

	if (order > CONFIG_ARM_DMA_IOMMU_ALIGNMENT)

		order = CONFIG_ARM_DMA_IOMMU_ALIGNMENT;

	count = ((PAGE_ALIGN(size) >> PAGE_SHIFT) +

		 (1 << mapping->order) - 1) >> mapping->order;