spi: Add s3c64xx SPI Controller driver (230d42d4) · Commits · 戴 / test

Each SPI controller has exactly one CS line and as such doesn't provide for multi-cs. We implement a workaround to support multi-cs by _not_ configuring the mux'ed CS pin for each SPI controller. The CS mechanism is assumed to be fully machine specific - the driver doesn't even assume some GPIO pin is used to control the CS. The driver selects between DMA and POLLING mode depending upon the xfer size - DMA mode for xfers bigger than FIFO size, POLLING mode otherwise. The driver has been designed to be capable of running SoCs since s3c64xx and till date, for that reason some of the register fields have been passed via, SoC specific, platform data. Signed-off-by:

Jassi Brar <jassi.brar@samsung.com> Signed-off-by:

Grant Likely <grant.likely@secretlab.ca>

drivers/spi/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -240,6 +240,13 @@ config SPI_S3C24XX_GPIO
		the inbuilt hardware cannot provide the transfer mode, or
		where the board is using non hardware connected pins.

		config SPI_S3C64XX
		tristate "Samsung S3C64XX series type SPI"
		depends on ARCH_S3C64XX && EXPERIMENTAL
		select S3C64XX_DMA
		help
		SPI driver for Samsung S3C64XX and newer SoCs.

		config SPI_SH_MSIOF
		tristate "SuperH MSIOF SPI controller"
		depends on SUPERH && HAVE_CLK

drivers/spi/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@ obj-$(CONFIG_SPI_MPC8xxx) += spi_mpc8xxx.o
		obj-$(CONFIG_SPI_PPC4xx) += spi_ppc4xx.o
		obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o
		obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx_hw.o
		obj-$(CONFIG_SPI_S3C64XX) += spi_s3c64xx.o
		obj-$(CONFIG_SPI_TXX9) += spi_txx9.o
		obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o
		obj-$(CONFIG_SPI_XILINX_OF) += xilinx_spi_of.o

drivers/spi/spi_s3c64xx.c

0 → 100644

+1196 −0

File added.

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