[PATCH 4/4 v6] iommu/fsl: Freescale PAMU driver and IOMMU API implementation.
B04825 at freescale.com
Sun Dec 2 09:58:20 EST 2012
Varun Sethi wrote:
> Following is a brief description of the PAMU hardware:
> PAMU determines what action to take and whether to authorize the action on
> the basis of the memory address, a Logical IO Device Number (LIODN), and
> PAACT table (logically) indexed by LIODN and address. Hardware devices which
> need to access memory must provide an LIODN in addition to the memory address.
> Peripheral Access Authorization and Control Tables (PAACTs) are the primary
> data structures used by PAMU. A PAACT is a table of peripheral access
> authorization and control entries (PAACE).Each PAACE defines the range of
> I/O bus address space that is accessible by the LIOD and the associated access
> There are two types of PAACTs: primary PAACT (PPAACT) and secondary PAACT
> (SPAACT).A given physical I/O device may be able to act as one or more
> independent logical I/O devices (LIODs). Each such logical I/O device is
> assigned an identifier called logical I/O device number (LIODN). A LIODN is
> allocated a contiguous portion of the I/O bus address space called the DSA window
> for performing DSA operations. The DSA window may optionally be divided into
> multiple sub-windows, each of which may be used to map to a region in system
> storage space. The first sub-window is referred to as the primary sub-window
> and the remaining are called secondary sub-windows.
> This patch provides the PAMU driver (fsl_pamu.c) and the corresponding IOMMU
> API implementation (fsl_pamu_domain.c). The PAMU hardware driver (fsl_pamu.c)
> has been derived from the work done by Ashish Kalra and Timur Tabi
> (timur at freescale.com).
> Signed-off-by: Timur Tabi<timur at freescale.com>
> Signed-off-by: Varun Sethi<Varun.Sethi at freescale.com>
Acked-by: Timur Tabi <timur at freescale.com>
Linux kernel developer at Freescale
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