This is try to support SFC found on Rockchip RV1108 platform. As Shawn's workload is a little heavy, I go on with his steps from v6 [1]. Feature: (1) Support x1, x2, x4 data bits mode (2) Support up to 4 chip select (3) Support two independent clock domain: AHB clock and SPI clock (4) Support DMA master up to 16KB/transfer Test environment: This patchset was tested on RK1108 evb boards with Winboud w25q256, Gigadevice GD25Q256, working fine with PIO or DMA mode. [1] https://patchwork.kernel.org/patch/9586107/ Changes in v7: - correct the fifo status check in pio read/write mode. - copy data from user buffer to dma buffer Changes in v6: - fold in Andy's improvement for checking fifo level before pio read - rename the controller to rv1108 since offically it's renamed and acked by Rob. - use dma_coerce_mask_and_coherent suggested by Andy. Changes in v5: - check if the buf is aligned to 32bit - check if the buf for dma comes from vmalloc - fix to use 1-1-n according to the current framework - avoid bytes cnt overflow Changes in v4: - use uppercase DMA for description - simplify the code of get_if_type - use dma_dir to simplify the code - simplify the rockchip_sfc_do_rd_wr - some minor improvements - add reset controller when doing resume Changes in v3: - use io{read32,write32}_rep to simplify the corner cases - remove more unnecessary bit definitions - some minor comment fixes and improvement - fix wrong unregister function - unify more code - use nor to avoid constantly replicating the whole sfc->flash[sfc->num_chip].nor - add email for MODULE_AUTHOR - remove #if 1 --- #endif - extract DMA code to imporve the code structure - reset all when failing to do dma - pass sfc to get_if_type - rename sfc-no-dma to sfc-no-DMA Changes in v2: - fix typos - add some comment for buffer and others operations - rename SFC_MAX_CHIP_NUM to MAX_CHIPSELECT_NUM - use u8 for cs - return -EINVAL for default case of get_if_type - use readl_poll_*() to check timeout cases - simplify and clarify some condition checks - rework the bitshifts to simplify the code - define SFC_CMD_DUMMY(x) - fix ummap for dma read path and finish all the cache maintenance. - rename to rockchip_sfc_chip_priv and embed struct spi_nor in it. - add MODULE_AUTHOR - add runtime PM and general PM support. - Thanks for Marek's comments. Link: http://lists.infradead.org/pipermail/linux-mtd/2016-November/070321.html Andy Yan (1): ARM: dts: rockchip: enable sfc for rv1108 evb Shawn Lin (2): mtd: spi-nor: Bindings for Rockchip serial flash controller mtd: spi-nor: add rockchip serial flash controller driver .../devicetree/bindings/mtd/rockchip-sfc.txt | 31 + MAINTAINERS | 8 + arch/arm/boot/dts/rv1108-evb.dts | 10 + arch/arm/boot/dts/rv1108.dtsi | 13 + drivers/mtd/spi-nor/Kconfig | 7 + drivers/mtd/spi-nor/Makefile | 3 +- drivers/mtd/spi-nor/rockchip-sfc.c | 942 +++++++++++++++++++++ 7 files changed, 1013 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/mtd/rockchip-sfc.txt create mode 100644 drivers/mtd/spi-nor/rockchip-sfc.c -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
