Date:	Wed, 1 Dec 2010 12:17:22 +0530
From:	"Varadarajan, Charulatha" <charu@...com>
To:	David Sin <davidsin@...com>
Cc:	Greg KH <greg@...ah.com>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC v2 0/8] TI DMM-TILER driver

On Wed, Dec 1, 2010 at 01:28, David Sin <davidsin@...com> wrote:
> Tiling and Isometric Lightweight Engine for Rotation (TILER) driver
>
> Dynamic Memory Manager (DMM) is a hardware block made by Texas Instruments.
> Within the DMM exists at least one TILER hardware component.  Its purpose is to
> organize video/image memory in a 2-dimensional fashion to limit memory
> bandwidth and facilitate 0 effort rotation and mirroring.  The TILER driver
> facilitates allocating, freeing, as well as mapping 2D blocks (areas) in the
> TILER container(s).  It also facilitates rotating and mirroring the allocated
> blocks or its rectangular subsections.
>
> TERMINOLOGY
>
> "slot"
>
> The basic TILER driver operates on blocks of slots.  A slot is the granularity
> of the TILER hardware device.  For all current uses it is 4K, but could also be
> 16 or 64K.  The DMM-TILER TRM refers to this as "page" but we want to separate
> this concept from the MMU pages.
>
> "page"
>
> The granularity of the MMU, used by the kernel.  This is 4K.
>
> "block"
>
> The TILER hardware component supports 1D and 2D blocks.  A 2D block is a
> rectangular arrangement of slots with arbitrary width and height in a 2D
> container.  A 1D block is a linear arrangement of slots with arbitrary length
>  in a 1D container.  This TILER driver only supports 2D blocks.
>
> "container"
>
> The TILER driver supports an arbitrary TILER container size.  However, for
> all current implementations it is 256 by 128 slots.  The container currently can
> only be used as a 2D container.
>
> "reserved area"
>
> Each block resides within a reserved area in the container.  This area may
> be larger than the actual set of slots that a block occupies.  The reason for
> this is to protect access from one block into another.  Since TILER container is
> mmap-ped into user space as individual pages, all slots that are spanned by
> that page become visible to the user.  The tiler driver allows restricting the
> granularity of the reserved area (default alignment) as well as the mapped
> area (granularity).
>
> Changes made from RFC v1: http://www.spinics.net/lists/linux-omap/msg33867.html
>
> Santosh Shilimkar:
> 1) Correct documentation location
> 2) Remove ioremap of RAM
> 3) Implement probe function and hwmod
> 4) Correct commenting style
> 5) Reduce use of barrier instances
>
> Linus Walleij:
> 1) Define TCM acryonym
>
> Russell King:
> 1) Implement probe function
> 2) Fix spelling mistake
> 3) Remove GFP_ATOMIC flag when calling dma_alloc_coherent for PAT array mem
> 4) Replace alloc_page and flush range calls with dma_alloc_coherent
>
> Nishanth Menon:
> 1) Address infinite while loop when reading dmm register
>
> Benoit Cousson:
> 1) Fix source file headers
> 2) Correct logical errors in device file
>
> Kevin Hilman:
> 1) Move DMM/TILER source code into driver/misc/tiler until a recommendation
> is made as to where it should go
>
> List of pending items in proposed order:
>
> * Determine driver source code location
>  (Currently, resides in drivers/misc/tiler)
> * Add area packing support (multiple blocks can reside in the same band/area)
>  to optimize area use
> * Add group-ID support (to specify which blocks can reside together in the
>  same area)
> * Add multiple search directions to TCM-SiTA
> * Add 1D block support (including adding 1D search algo to TCM-SiTA)
> * Optimize mutex handling (don.t hold mutex during memory
>  allocation/mapping/cache flushing)
> * Add block reference counting, support for sharing blocks
> * Move all kernel-API-s to tiler-iface.c
> * Support orphaned block support (in preparation for process cleanup support)
> * Change block identification from physical address to key-ID pair
>  (in preparation for user space support, and process security)
> * Add support for process security (blocks from separate processes never
>  reside in the same band)
> * Support file interface (ioctl and mmap)
> * Support for buffers (ordered list of blocks that are mapped to userspace
>  together, such as YUV420sp)
> * Support 1D user buffer mapping into TILER container
> * Support for block pre-reservation (to further optimize area use)
>
> David Sin (1):
>  TILER-DMM: DMM-PAT driver for TI TILER
>
> Lajos Molnar (6):
>  TILER-DMM: Container manager interface and utility definitons
>  TILER-DMM: TILER Memory Manager interface and implementation
>  TILER-DMM: TILER interface file and documentation
>  TILER-DMM: Geometry and view manipulation functions
>  TILER-DMM: Main TILER driver implementation
>  TILER-DMM: Linking TILER driver into the Linux kernel build
>
> Ravi Ramachandra (1):
>  TILER-DMM: Sample TCM implementation: Simple TILER Allocator (SiTA)
>
>  Documentation/arm/OMAP/TILER             |  126 +++++++++
>  arch/arm/mach-omap2/Makefile             |    1 +
>  arch/arm/mach-omap2/dmm-omap44xx.c       |   81 ++++++
>  arch/arm/mach-omap2/include/mach/dmm.h   |   92 +++++++
>  arch/arm/mach-omap2/include/mach/tiler.h |  173 ++++++++++++
>  drivers/misc/Kconfig                     |    5 +
>  drivers/misc/Makefile                    |    1 +
>  drivers/misc/tiler/Kconfig               |   72 +++++
>  drivers/misc/tiler/Makefile              |    7 +
>  drivers/misc/tiler/_tiler.h              |   48 ++++
>  drivers/misc/tiler/dmm-main.c            |  187 +++++++++++++
>  drivers/misc/tiler/tcm.h                 |  171 ++++++++++++
>  drivers/misc/tiler/tcm/Makefile          |    1 +
>  drivers/misc/tiler/tcm/_tcm-sita.h       |   61 +++++
>  drivers/misc/tiler/tcm/tcm-sita.c        |  422 ++++++++++++++++++++++++++++++
>  drivers/misc/tiler/tcm/tcm-sita.h        |   28 ++
>  drivers/misc/tiler/tcm/tcm-utils.h       |   51 ++++
>  drivers/misc/tiler/tiler-geom.c          |  362 +++++++++++++++++++++++++
>  drivers/misc/tiler/tiler-iface.c         |   66 +++++
>  drivers/misc/tiler/tiler-main.c          |  405 ++++++++++++++++++++++++++++
>  drivers/misc/tiler/tmm-pat.c             |  266 +++++++++++++++++++
>  drivers/misc/tiler/tmm.h                 |  103 ++++++++
>  22 files changed, 2729 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/arm/OMAP/TILER
>  create mode 100644 arch/arm/mach-omap2/dmm-omap44xx.c
>  create mode 100644 arch/arm/mach-omap2/include/mach/dmm.h
>  create mode 100644 arch/arm/mach-omap2/include/mach/tiler.h
>  create mode 100644 drivers/misc/tiler/Kconfig
>  create mode 100644 drivers/misc/tiler/Makefile
>  create mode 100644 drivers/misc/tiler/_tiler.h
>  create mode 100644 drivers/misc/tiler/dmm-main.c
>  create mode 100644 drivers/misc/tiler/tcm.h
>  create mode 100644 drivers/misc/tiler/tcm/Makefile
>  create mode 100644 drivers/misc/tiler/tcm/_tcm-sita.h
>  create mode 100644 drivers/misc/tiler/tcm/tcm-sita.c
>  create mode 100644 drivers/misc/tiler/tcm/tcm-sita.h
>  create mode 100644 drivers/misc/tiler/tcm/tcm-utils.h
>  create mode 100644 drivers/misc/tiler/tiler-geom.c
>  create mode 100644 drivers/misc/tiler/tiler-iface.c
>  create mode 100644 drivers/misc/tiler/tiler-main.c
>  create mode 100644 drivers/misc/tiler/tmm-pat.c
>  create mode 100644 drivers/misc/tiler/tmm.h

The dmm driver is making use of omap_hwmod fw. But I could not see a patch
to add  dmm hwmod data to omap4 hwmod base in this series. Is this patch series
tested?
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