Add external dma support for Synopsys MSHC Synopsys DesignWare mobile storage host controller supports three types of transfer mode: pio, internal dma and external dma. However, dw_mmc can only supports pio and internal dma now. Thus some platforms using dw-mshc integrated with generic dma can't work in dma mode. So we submit this patch to achieve it.
And the config option, CONFIG_MMC_DW_IDMAC, was added by Will Newton (commit:f95f3850) for the first version of dw_mmc and never be touched since then. At that time dt-bindings hadn't been introduced into dw_mmc yet means we should select CONFIG_MMC_DW_IDMAC to enable internal dma mode at compile time. Nowadays, device-tree helps us to support a variety of boards with one kernel. That's why we need to remove it and decide the transfer mode by reading dw_mmc's HCON reg at runtime. This RFC patch needs lots of ACKs. I know it's hard, but it does need someone to make the running. Patch does the following things: - remove CONFIG_MMC_DW_IDMAC config option - add bindings for edmac used by synopsys-dw-mshc at runtime - add edmac support for synopsys-dw-mshc Patch is based on next of git://git.linaro.org/people/ulf.hansson/mmc Changes in v4: - remove "host->trans_mode" and use "host->use_dma" to indicate transfer mode. - remove all bt-bindings' changes since we don't need new properities. - check transfer mode at runtime by reading HCON reg - spilt defconfig changes for each sub-architecture - fix the title of cover letter - reuse some code for reducing code size Changes in v3: - choose transfer mode at runtime - remove all CONFIG_MMC_DW_IDMAC config option - add supports-idmac property for some platforms Changes in v2: - Fix typo of dev_info msg - remove unused dmach from declaration of dw_mci_dma_slave Shawn Lin (9): mmc: dw_mmc: Add external dma interface support Documentation: synopsys-dw-mshc: add bindings for idmac and edmac mips: pistachio_defconfig: remove CONFIG_MMC_DW_IDMAC arc: axs10x_defconfig: remove CONFIG_MMC_DW_IDMAC arm: exynos_defconfig: remove CONFIG_MMC_DW_IDMAC arm: hisi_defconfig: remove CONFIG_MMC_DW_IDMAC arm: lpc18xx_defconfig: remove CONFIG_MMC_DW_IDMAC arm: multi_v7_defconfig: remove CONFIG_MMC_DW_IDMAC arm: zx_defconfig: remove CONFIG_MMC_DW_IDMAC .../devicetree/bindings/mmc/synopsys-dw-mshc.txt | 25 ++ arch/arc/configs/axs101_defconfig | 1 - arch/arc/configs/axs103_defconfig | 1 - arch/arc/configs/axs103_smp_defconfig | 1 - arch/arm/configs/exynos_defconfig | 1 - arch/arm/configs/hisi_defconfig | 1 - arch/arm/configs/lpc18xx_defconfig | 1 - arch/arm/configs/multi_v7_defconfig | 1 - arch/arm/configs/zx_defconfig | 1 - arch/mips/configs/pistachio_defconfig | 1 - drivers/mmc/host/Kconfig | 11 +- drivers/mmc/host/dw_mmc-pltfm.c | 2 + drivers/mmc/host/dw_mmc.c | 258 +++++++++++++++++---- include/linux/mmc/dw_mmc.h | 27 ++- 14 files changed, 257 insertions(+), 75 deletions(-) -- 2.3.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
