v2013/7/14 Gerhard Sittig [off-list ref]:

this series
- introduces slave s/g support (that's support for DMA transfers which
   involve peripherals in contrast to mem-to-mem transfers)
- adds device tree based lookup support for DMA channels
- combines floating patches and related feedback which already covered
   several aspects of what the suggested LPB driver needs, to demonstrate
   how integration might be done
- carries Q&D SD card support to enable another DMA client during test,
   while this patch needs to get dropped upon pickup

Changes in v2:

- re-order mpc8308 related code paths for improved readability, no
   change in behaviour, introduction of symbolic channel names here
   already
- squash 'execute() start condition' and 'terminate all' into the
   introduction of 'slave s/g prep' and 'device control' support; refuse
   s/g lists with more than one item since slave support is operational
   yet proper s/g support is missing (can get addressed later)
- always start transfers from software on MPC8308 as there are no
   external request lines for peripheral flow control
- drop dt-bindings header file and symbolic channel names in OF nodes

Changes in v3 and v4:
 Part 1/5:
 - use #define instead of enum since individual channels don't require
    special handling.
 Part 2/5:
 - add a flag "will_access_peripheral" to DMA transfer descriptor
    according recommendations of Gerhard Sittig.
    This flag is set in mpc_dma_prep_memcpy() and mpc_dma_prep_slave_sg()
    and is evaluated in mpc_dma_execute() to choose a type of start for
    the transfer.
 - prevent descriptors of transfers which involve peripherals from
    being chained together;
    each of such transfers needs hardware initiated start.
 - add locking while working with struct mpc_dma_chan
    according recommendations of Lars-Peter Clausen.
 - remove default nbytes value. Client kernel modules must set
    src_maxburst and dst_maxburst fields of struct dma_slave_config (dmaengine.h).

Changes in v5:
 Part 2/5:
 - add and improve comments;
 - improve the code moving transfer descriptors from 'queued' to 'active' list
    in mpc_dma_execute();
 - allow mpc_dma_prep_slave_sg() to run with non-empty 'active' list;
 - take 'mdesc' back to 'free' list in case of error in mpc_dma_prep_slave_sg();
 - improve checks of the transfer parameters;
 - provide the default value for 'maxburst' in mpc_dma_device_control().

Changes in v6:
 Part 2/5:
 - remove doubtful comment;
 - fix coding style issues;
 - set default value for 'maxburst' to 1 which applies to most cases;
 Part 3/5:
 - use dma_get_slave_channel() instead of dma_request_channel()
    in new function of_dma_xlate_by_chan_id() according recommendations of
    Arnd Bergmann;
 Part 4/5:
 - set DMA_PRIVATE flag for MPC512x DMA controller since its driver relies on
    of_dma_xlate_by_chan_id() which doesn't use dma_request_channel()
    any more; (removed in v7)
 - resolve little patch conflict;
 Part 5/5:
 - resolve little patch conflict;

Changes in v7:
 Part 2:
 - improve comment;
 Part 4:
 - split in two separate patches. Part 4/6 contains device tree
    binding document and in part 5/6 MPC512x DMA controller is registered
    for device tree channel lookup;
 - remove setting DMA_PRIVATE flag for MPC512x DMA controller from part 5/6;

known issues:
- it's yet to get confirmed whether MPC8308 can use slave support or
   whether the DMA controller's driver shall actively reject it, the
   information that's available so far suggests that peripheral transfers
   to IP bus attached I/O is useful and shall not get blocked right away

 - adding support for transfers which don't increment the RAM address or
    do increment the peripheral "port's" address is easy with
    this implementation; but which options of the common API
    should be used for specifying such transfers?
 - device tree binding document for the MPC512x DMA controller needs
    to be improved.


Alexander Popov (3):
  dma: mpc512x: reorder mpc8308 specific instructions
  dma: mpc512x: add support for peripheral transfers
  dma: of: Add common xlate function for matching by channel id

Gerhard Sittig (3):
  dma: mpc512x: add device tree binding document
  dma: mpc512x: register for device tree channel lookup
  HACK mmc: mxcmmc: enable clocks for the MPC512x

 .../devicetree/bindings/dma/mpc512x-dma.txt        |  55 ++++
 arch/powerpc/boot/dts/mpc5121.dtsi                 |   1 +
 drivers/dma/mpc512x_dma.c                          | 293 +++++++++++++++++++--
 drivers/dma/of-dma.c                               |  35 +++
 drivers/mmc/host/mxcmmc.c                          |  42 ++-
 include/linux/of_dma.h                             |   4 +
 6 files changed, 391 insertions(+), 39 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma/mpc512x-dma.txt

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