[PATCH 0/9] DMA engine cookie handling cleanups

[Russell King - ARM Linux <linux@arm.linux.org.uk>]

This patch series cleans up the handling of cookies in DMA engine drivers.
This is done by providing a set of inline library functions for common
tasks:

- moving the 'last completed cookie' into struct dma_chan - everyone
  has this in their driver private channel data structure

- consolidate allocation of cookies to DMA descriptors

- common way to update 'last completed cookie' value

- standard way to implement tx_status callback and update the residue

- consolidate initialization of cookies

- update implementations differing from the majority of DMA engine drivers
  to behave the same as the majority implementation in respect of cookies

What this means is that we get to the point where all DMA engine drivers
will hand out cookie value '2' as the first, and incrementing cookie
values up to INT_MAX, returning to cookie '1' as the next cookie.

Think of this patch series as round 1...  I am hoping over time that more
code can be consolidated between the DMA engine drivers and end up with a
consistent way to handle various common themes in DMA engine hardware
(like physical channel<->peripheral request signal selection.)

I've only build-tested this stuff on a few ARM configs, and my ability
to run-test this stuff is even more limited by all the broken useless DMA
engine hardware I have access to (mostly pl08x based) so having some
tested-bys would be a great advantage.

Overall, the diffstat looks like this:

 arch/arm/include/asm/hardware/iop_adma.h |    2 -
 drivers/dma/amba-pl08x.c                 |   38 ++++---------
 drivers/dma/at_hdmac.c                   |   48 ++++------------
 drivers/dma/at_hdmac_regs.h              |    2 -
 drivers/dma/coh901318.c                  |   39 +++----------
 drivers/dma/dmaengine.h                  |   89 ++++++++++++++++++++++++++++++
 drivers/dma/dw_dmac.c                    |   43 +++-----------
 drivers/dma/dw_dmac_regs.h               |    1 -
 drivers/dma/ep93xx_dma.c                 |   25 ++------
 drivers/dma/fsldma.c                     |   24 ++------
 drivers/dma/fsldma.h                     |    1 -
 drivers/dma/imx-dma.c                    |   32 ++---------
 drivers/dma/imx-sdma.c                   |   23 ++------
 drivers/dma/intel_mid_dma.c              |   37 +++---------
 drivers/dma/intel_mid_dma_regs.h         |    2 -
 drivers/dma/ioat/dma.c                   |   21 +++----
 drivers/dma/ioat/dma.h                   |   23 --------
 drivers/dma/ioat/dma_v2.c                |   13 ++---
 drivers/dma/ioat/dma_v3.c                |   11 ++--
 drivers/dma/iop-adma.c                   |   51 ++++-------------
 drivers/dma/ipu/ipu_idmac.c              |   22 ++-----
 drivers/dma/mpc512x_dma.c                |   25 +++------
 drivers/dma/mv_xor.c                     |   34 ++---------
 drivers/dma/mv_xor.h                     |    3 -
 drivers/dma/mxs-dma.c                    |   23 ++------
 drivers/dma/pch_dma.c                    |   34 ++---------
 drivers/dma/pl330.c                      |   36 ++----------
 drivers/dma/ppc4xx/adma.c                |   49 +++-------------
 drivers/dma/ppc4xx/adma.h                |    2 -
 drivers/dma/shdma.c                      |   30 +++-------
 drivers/dma/shdma.h                      |    1 -
 drivers/dma/sirf-dma.c                   |   23 ++------
 drivers/dma/ste_dma40.c                  |   36 +++---------
 drivers/dma/timb_dma.c                   |   28 +++-------
 drivers/dma/txx9dmac.c                   |   41 +++-----------
 drivers/dma/txx9dmac.h                   |    1 -
 include/linux/amba/pl08x.h               |    2 -
 include/linux/dmaengine.h                |    2 +
 38 files changed, 291 insertions(+), 626 deletions(-)