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linux/drivers/mtd/spi-nor/Kconfig

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mtd: spi-nor: allow to be built as module There's no reason this can't be a module. Also, give SPI-NOR its own submenu. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Reviewed-by: Marek Vasut <marex@denx.de>
2014-04-10 18:05:34 +00:00
menuconfig MTD_SPI_NOR
tristate "SPI-NOR device support"
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>
2014-02-24 10:37:37 +00:00
depends on MTD
help
This is the framework for the SPI NOR which can be used by the SPI
device drivers and the SPI-NOR device driver.
mtd: spi-nor: shorten Kconfig naming Signed-off-by: Brian Norris <computersforpeace@gmail.com> Reviewed-by: Marek Vasut <marex@denx.de> Acked-by: Huang Shijie <b32955@freescale.com>
2014-04-09 03:30:25 +00:00
if MTD_SPI_NOR
mtd: spi-nor: add Kconfig option to disable 4K sectors Current situation with 4K sectors is quite messy. First of all, some MTD "users" don't work with such small size. An example may be UBIFS which requires 15 KiB erase blocks as a minimum. In theory spi-nor should provide multiple erase regions and MTD "users" should use the one they need. Unforunately that is not implemented. In the result our flashes database in spi-nor is hackish. For some flashes we pretend they don't support 4K sectors just because some distribution uses UBIFS on it. This ofc leads to conflicts, like Samsung using w25q128 with 4K sectors vs. OpenWrt requiring it to pretend it's 64 KiB blocks only. My idea (plan?) for fixing this situation: 1) Use real hw info (this requires a way for disabling 4K for now) 2) Provide detailed info about erase regions 3) Make UBIFS work with devices that support 4K sectors Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2014-08-17 09:27:26 +00:00
config MTD_SPI_NOR_USE_4K_SECTORS
bool "Use small 4096 B erase sectors"
default y
help
Many flash memories support erasing small (4096 B) sectors. Depending
on the usage this feature may provide performance gain in comparison
to erasing whole blocks (32/64 KiB).
Changing a small part of the flash's contents is usually faster with
small sectors. On the other hand erasing should be faster when using
64 KiB block instead of 16 × 4 KiB sectors.
Please note that some tools/drivers/filesystems may not work with
4096 B erase size (e.g. UBIFS requires 15 KiB as a minimum).
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>
2014-02-24 10:37:42 +00:00
config SPI_FSL_QUADSPI
tristate "Freescale Quad SPI controller"
mtd: spi-nor: shorten Kconfig naming Signed-off-by: Brian Norris <computersforpeace@gmail.com> Reviewed-by: Marek Vasut <marex@denx.de> Acked-by: Huang Shijie <b32955@freescale.com>
2014-04-09 03:30:25 +00:00
depends on ARCH_MXC
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>
2014-02-24 10:37:42 +00:00
help
This enables support for the Quad SPI controller in master mode.
We only connect the NOR to this controller now.
mtd: spi-nor: shorten Kconfig naming Signed-off-by: Brian Norris <computersforpeace@gmail.com> Reviewed-by: Marek Vasut <marex@denx.de> Acked-by: Huang Shijie <b32955@freescale.com>
2014-04-09 03:30:25 +00:00
endif # MTD_SPI_NOR
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