[RFC 3/5] ARM: OMAP: iommu: declare a private iommu binding struct

[Tony Lindgren]

* Ohad Ben-Cohen <ohad at wizery.com> [110925 03:27]:
> Declare an omap iommu private struct, which binds an iommu user
> to its iommu device. This struct should be placed at the iommu user's
> dev_archdata so generic IOMMU API can be used without having to
> utilize omap-specific plumbing anymore.
> 
> While at it, provide an accessor method to ease the retrieval of the
> omap_iommu handle from a user device.
> 
> Signed-off-by: Ohad Ben-Cohen <ohad at wizery.com>
> Cc: Tony Lindgren <tony at atomide.com>
> Cc: Hiroshi DOYU <Hiroshi.DOYU at nokia.com>

Acked-by: Tony Lindgren <tony at atomide.com>


> ---
>  arch/arm/plat-omap/include/plat/iommu.h |   26 ++++++++++++++++++++++++++
>  1 files changed, 26 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/plat-omap/include/plat/iommu.h b/arch/arm/plat-omap/include/plat/iommu.h
> index a1d79ee..fa11ee2 100644
> --- a/arch/arm/plat-omap/include/plat/iommu.h
> +++ b/arch/arm/plat-omap/include/plat/iommu.h
> @@ -111,6 +111,32 @@ struct iommu_platform_data {
>  	u32 da_end;
>  };
>  
> +/**
> + * struct iommu_arch_data - omap iommu private data
> + * @name: name of the iommu device
> + * @iommu_dev: handle of the iommu device
> + *
> + * This is an omap iommu private data object, which binds an iommu user
> + * to its iommu device. This object should be placed at the iommu user's
> + * dev_archdata so generic IOMMU API can be used without having to
> + * utilize omap-specific plumbing anymore.
> + */
> +struct omap_iommu_arch_data {
> +	const char *name;
> +	struct omap_iommu *iommu_dev;
> +};
> +
> +/**
> + * dev_to_omap_iommu() - retrieves an omap iommu object from a user device
> + * @dev: iommu client device
> + */
> +static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
> +{
> +	struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
> +
> +	return arch_data->iommu_dev;
> +}
> +
>  /* IOMMU errors */
>  #define OMAP_IOMMU_ERR_TLB_MISS		(1 << 0)
>  #define OMAP_IOMMU_ERR_TRANS_FAULT	(1 << 1)
> -- 
> 1.7.4.1
>