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 since v1: - 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 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 - currently encoded constraints do work for SD card and LPB test suite (all known DMA clients ATM), but will need more tuning or support for automatic adjustment for transfers of arbitrary length oh, and I'd like to get feedback on whether attribution handling is appropriate, as I had to squash patches from several authors to not break bisectability (compilation had worked, but the code had not run successfully on all previously supported hardware) Alexander, when you pickup this series and improve slave s/g support and adjust it for more general use, you have my OK to incorporate and further adjust the parts that I've contributed Alexander Popov (1): dma: mpc512x: add support for peripheral transfers Gerhard Sittig (3): dma: mpc512x: re-order mpc8308 specific instructions dma: mpc512x: register for device tree channel lookup HACK mmc: mxcmmc: enable clocks for the MPC512x Lars-Peter Clausen (1): dma: of: Add common xlate function for matching by channel id .../devicetree/bindings/dma/mpc512x-dma.txt | 55 +++++ arch/powerpc/boot/dts/mpc5121.dtsi | 1 + drivers/dma/mpc512x_dma.c | 237 +++++++++++++++++--- drivers/dma/of-dma.c | 47 ++++ drivers/mmc/host/mxcmmc.c | 41 ++-- include/linux/of_dma.h | 4 + 6 files changed, 344 insertions(+), 41 deletions(-) create mode 100644 Documentation/devicetree/bindings/dma/mpc512x-dma.txt -- 1.7.10.4 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
