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mtd: spi-nor: Add Freescale QuadSPI driver

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(0) What is the QuadSPI controller?

    The QuadSPI(Quad Serial Peripheral Interface) acts as an interface to
    one single or two external serial flash devices, each with up to 4
    bidirectional data lines.

(1) The QuadSPI controller is driven by the LUT(Look-up Table) registers.
    The LUT registers are a look-up-table for sequences of instructions.
    A valid sequence consists of four LUT registers.

(2) The definition of the LUT register shows below:

    ---------------------------------------------------
    | INSTR1 | PAD1 | OPRND1 | INSTR0 | PAD0 | OPRND0 |
    ---------------------------------------------------

    There are several types of INSTRx, such as:
	CMD	: the SPI NOR command.
	ADDR	: the address for the SPI NOR command.
	DUMMY	: the dummy cycles needed by the SPI NOR command.
	....

    There are several types of PADx, such as:
	PAD1	: use a singe I/O line.
	PAD2	: use two I/O lines.
	PAD4	: use quad I/O lines.
	....

(3) Test this driver with the JFFS2 and UBIFS:

    For jffs2:
    -------------
	#flash_eraseall /dev/mtd0
	#mount -t jffs2 /dev/mtdblock0 tmp
	#bonnie++ -d tmp -u 0 -s 10 -r 5

    For ubifs:
    -------------
	#flash_eraseall /dev/mtd0
	#ubiattach /dev/ubi_ctrl -m 0
	#ubimkvol /dev/ubi0 -N test -m
	#mount -t ubifs ubi0:test tmp
	#bonnie++ -d tmp -u 0 -s 10 -r 5

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Huang Shijie 2014-02-24 18:37:42 +08:00 committed by Brian Norris
parent c7a8a11c6b
commit e46ecda764
3 changed files with 1016 additions and 0 deletions
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6
drivers/mtd/spi-nor/Kconfig
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@ -4,3 +4,9 @@ config MTD_SPI_NOR_BASE
help
This is the framework for the SPI NOR which can be used by the SPI
device drivers and the SPI-NOR device driver.
config SPI_FSL_QUADSPI
tristate "Freescale Quad SPI controller"
depends on ARCH_MXC && MTD_SPI_NOR_BASE
help
This enables support for the Quad SPI controller in master mode.
We only connect the NOR to this controller now.

1
drivers/mtd/spi-nor/Makefile
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@ -1 +1,2 @@
obj-$(CONFIG_MTD_SPI_NOR_BASE) += spi-nor.o
obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o

1009
drivers/mtd/spi-nor/fsl-quadspi.c Normal file
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