[PATCH v5 0/3] new Atmel DMA controller

[Ludovic Desroches]

On Mon, Sep 22, 2014 at 03:22:15PM +0200, Ludovic Desroches wrote:
> Hi,
> 
> This set of patches introduces support for the new Atmel DMA controller know as
> XDMAC and available on SAMA5D4.
> 
> Driver updated according to Arnd and Nicolas comments.
> 
> Changes from:
> - v4
>   - compile the driver if COMPILE_TEST is selected

Maxime told me that I can't use _relaxed accessors if I depends on
COMPILE_TEST since they are not generic.

So which one I have to keep? To be honest, I have no idea about
performance gain using _relaxed. Due to the use of descriptors, I feel
like saying using _relaxed or not should not change performances.


>   - merge header file into at_xdmac.c
>   - use write memory barriers before starting the channel
>   - init active_xfer to false when taking a descriptor from the free
>   descriptors list
>   - remove dma capabilities mask
>   - use CONFIG_PM instead of CONFIG_PM_SLEEP for prepare function
>   - style fixes
>   - update documentation to add the <chip> compatible description
>   - add maintener entry
> - v3
>   - use dma_get_any_slave_channel instead of dma_request_channel
>   - fix tx_status behavior for non active transfers
>   - rename at_xdmac_terminate_xfer
>   - replace suspend/resume no irq variants by late/early variants
>   - no more use dev res to request the irq, use the legacy way
>   - add slave capabilities
> - v2
>   - documentation updated
>   - fix locking issues
> - v1
>   - add power management stuff
>   - check maxburst value
>   - revert subsys_initcall remove, EPROBE_DEFER not yet available on the kernel
>   version I use to do the tests, moreover other devices are not ready to use it
> - RFC:
>   - DMA_SUCCESS replaced by DMA_COMPLETE
>   - fix memcpy issue caused by a mistake in interfaces used
>   - add filter function
>   - remove some parameters from device tree since we can get them through the
>   dma slave configuration
>   - use readl/writel relaxed
>   - remove subsys_initcall
>   - synchronize irq before killing tasklets
>   - use BIT macro
>   - misc cleanup
> 
> 
> Ludovic Desroches (3):
>   dma: at_xdmac: creation of the atmel eXtended DMA Controller driver
>   ARM: dts: at_xdmac: add bindings documentation
>   MAINTAINERS: add entry for Atmel XDMA driver
> 
>  .../devicetree/bindings/dma/atmel-xdma.txt         |   50 +
>  MAINTAINERS                                        |    7 +
>  drivers/dma/Kconfig                                |    7 +
>  drivers/dma/Makefile                               |    1 +
>  drivers/dma/at_xdmac.c                             | 1491 ++++++++++++++++++++
>  include/dt-bindings/dma/at91.h                     |   25 +
>  6 files changed, 1581 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/atmel-xdma.txt
>  create mode 100644 drivers/dma/at_xdmac.c
> 
> -- 
> 2.0.3
>