kernel/include/linux/mtd/nand-ecc-mxic.h, branch linux-6.16.y

mtd: spinand: Constify struct nand_ecc_engine_ops

2024-10-21T09:55:50Z

'struct nand_ecc_engine_ops' are not modified in these drivers. Constifying this structure moves some data to a read-only section, so increases overall security, especially when the structure holds some function pointers. Update the prototype of mxic_ecc_get_pipelined_ops() accordingly. On a x86_64, with allmodconfig, as an example: Before: ====== text data bss dec hex filename 16709 1374 16 18099 46b3 drivers/mtd/nand/ecc-mxic.o After: ===== text data bss dec hex filename 16789 1294 16 18099 46b3 drivers/mtd/nand/ecc-mxic.o Signed-off-by: Christophe JAILLET Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/72597e9de2320a4109be2112e696399592edacd4.1729271136.git.christophe.jaillet@wanadoo.fr

spi: mxic: Add support for pipelined ECC operations

2022-02-10T08:32:30Z

Some SPI-NAND chips do not have a proper on-die ECC engine providing error correction/detection. This is particularly an issue on embedded devices with limited resources because all the computations must happen in software, unless an external hardware engine is provided. These external engines are new and can be of two categories: external or pipelined. Macronix is providing both, the former being already supported. The second, however, is very SoC implementation dependent and must be instantiated by the SPI host controller directly. An entire subsystem has been contributed to support these engines which makes the insertion into another subsystem such as SPI quite straightforward without the need for a lot of specific functions. Signed-off-by: Miquel Raynal Reviewed-by: Mark Brown Link: https://lore.kernel.org/linux-mtd/20220202144536.393792-1-miquel.raynal@bootlin.com

mtd: nand: mxic-ecc: Support SPI pipelined mode

2022-02-10T08:32:25Z

Introduce the support for another possible configuration: the ECC engine may work as DMA master (pipelined) and move itself the data to/from the NAND chip into the buffer, applying the necessary corrections/computations on the fly. This driver offers an ECC engine implementation that must be instatiated from a SPI controller driver. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20211216111654.238086-17-miquel.raynal@bootlin.com