Hello,
This patch sets adds a new driver for the DMA controller found in the R-Car
Gen2 SoCs under the name "Direct Memory Access Controller for System
(SYS-DMAC)". Support for the "Realtime Direct Memory Access Controller
(RT-DMAC)" and "Direct Memory Access Controller for Audio (Audio-DMAC)" will
be added later.
For the rationale of why a new driver is needed, and performance figures,
please see the cover letter of v1 ("[PATCH 0/7] R-Car Gen2 DMA Controller
driver") [1].
Support for hardware descriptors lists is under development and will be posted
in the near future. No change to the DT bindings will be needed.
The first five patches should go through the DMA engine tree, while the last
three patches should go through the Renesas tree. If the driver can make it to
v3.17 merging the platform changes will be easier.
Morimoto-san, could you please test if this version fixes the channel filter
issue you've experienced with the R-Car audio driver ? I would also appreciate
if you could tell me how to test cyclic DMA transfers using the audio driver.
Changes since v1:
- Allocate IRQ name strings dynamically
- Only call the callback function if one is supplied
- Don't overallocate sg list entries
- Allocate sg list entries with GFP_KERNEL
- Don't manage function clock manually
- Make channel filter ignore unrelated devices
- Document why the cyclic sg list is kcalloc'ed
- Remove ch15 from interrupt names in DT
- Replace CONFIG_OF with OF in Kconfig
[1] http://www.spinics.net/lists/linux-sh/msg33768.html
Laurent Pinchart (8):
dmaengine: sh: Rework Kconfig and Makefile
dmaengine: shdma: Make channel filter ignore unrelated devices
dmaengine: shdma: Allocate cyclic sg list dynamically
dmaengine: rcar-dmac: Add device tree bindings documentation
dmaengine: rcar-dmac: Add Renesas R-Car Gen2 DMA Controller (DMAC)
driver
ARM: shmobile: r8a7790: Add DMAC clocks to DT
ARM: shmobile: r8a7790: Add DMAC devices to DT
ARM: shmobile: r8a7791: Add DMAC devices to DT
.../devicetree/bindings/dma/renesas,rcar-dmac.txt | 98 ++
arch/arm/boot/dts/r8a7790.dtsi | 66 +-
arch/arm/boot/dts/r8a7791.dtsi | 60 +
drivers/dma/sh/Kconfig | 30 +-
drivers/dma/sh/Makefile | 15 +-
drivers/dma/sh/rcar-dmac.c | 1525 ++++++++++++++++++++
drivers/dma/sh/shdma-base.c | 101 +-
7 files changed, 1845 insertions(+), 50 deletions(-)
create mode 100644 Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt
create mode 100644 drivers/dma/sh/rcar-dmac.c
--
Regards,
Laurent Pinchart
--
To unsubscribe from this list: send the line "unsubscribe dmaengine" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
