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SubjectRe: [RFC 3/5] ARM: OMAP: iommu: declare a private iommu binding struct
* Ohad Ben-Cohen <ohad@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@wizery.com>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>

Acked-by: Tony Lindgren <tony@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
>


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