Commit Graph

57 Commits

Author SHA1 Message Date
Brian Norris 58b89a1f4c mtd: spi-nor: unify read opcode variants with ST SPI FSM
serial_flash_cmds.h defines our opcodes a little differently. Let's
borrow its naming, since it's borrowed from the SFDP standard, and it's
more extensible.

This prepares us for merging serial_flash_cmds.h and spi-nor.h opcode
listing.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Huang Shijie <b32955@freescale.com>
2014-04-14 11:23:00 -07:00
Brian Norris b02e7f3ef0 mtd: spi-nor: re-name OPCODE_* to SPINOR_OP_*
Qualify these with a better namespace, and prepare them for use in more
drivers.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Huang Shijie <b32955@freescale.com>
2014-04-14 11:23:00 -07:00
Huang Shijie 8eabdd1ec1 mtd: spi-nor: add the copyright information
Add the copyright information for spi-nor.c and spi-nor.h.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2014-04-14 11:23:00 -07:00
Brian Norris b61834b0d0 mtd: spi-nor: EXPORT symbols which could be used by module drivers
Fix errors like this:

    ERROR: "spi_nor_ids" [drivers/mtd/devices/m25p80.ko] undefined!
    ERROR: "spi_nor_scan" [drivers/mtd/devices/m25p80.ko] undefined!
    make[1]: *** [__modpost] Error 1
    make: *** [modules] Error 2

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2014-04-14 11:22:59 -07:00
Huang Shijie e46ecda764 mtd: spi-nor: Add Freescale QuadSPI driver
(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>
2014-04-14 11:22:59 -07:00
Huang Shijie 0d8c11c012 mtd: spi-nor: add a helper to find the spi_device_id
Add the spi_nor_match_id() to find the proper spi_device_id with the
NOR flash's name in the spi_nor_ids table.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2014-04-14 11:22:58 -07:00
Huang Shijie b199489d37 mtd: spi-nor: add the framework for SPI NOR
This patch cloned most of the m25p80.c. In theory, it adds a new spi-nor layer.

Before this patch, the layer is like:

                   MTD
         ------------------------
                  m25p80
         ------------------------
	       spi bus driver
         ------------------------
	        SPI NOR chip

After this patch, the layer is like:
                   MTD
         ------------------------
                  spi-nor
         ------------------------
                  m25p80
         ------------------------
	       spi bus driver
         ------------------------
	       SPI NOR chip

With the spi-nor controller driver(Freescale Quadspi), it looks like:
                   MTD
         ------------------------
                  spi-nor
         ------------------------
                fsl-quadspi
         ------------------------
	       SPI NOR chip

New APIs:
   spi_nor_scan: used to scan a spi-nor flash.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
[Brian: rebased to include additional m25p_ids[] entry]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2014-04-14 11:22:58 -07:00