kernel/linux.git/include/linux/mtd/onfi.h, branch v6.6.132

mtd: rawnand: Ensure the nand chip supports cached reads

2023-10-16T08:47:22+00:00

Both the JEDEC and ONFI specification say that read cache sequential support is an optional command. This means that we not only need to check whether the individual controller supports the command, we also need to check the parameter pages for both ONFI and JEDEC NAND flashes before enabling sequential cache reads. This fixes support for NAND flashes which don't support enabling cache reads, i.e. Samsung K9F4G08U0F or Toshiba TC58NVG0S3HTA00. Sequential cache reads are now only available for ONFI and JEDEC devices, if individual vendors implement this, it needs to be enabled per vendor. Tested on i.MX6Q with a Samsung NAND flash chip that doesn't support sequential reads. Fixes: 003fe4b9545b ("mtd: rawnand: Support for sequential cache reads") Cc: stable@vger.kernel.org Signed-off-by: Rouven Czerwinski Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20230922141717.35977-1-r.czerwinski@pengutronix.de

mtd: rawnand: Support enabling NV-DDR through SET_FEATURES

2021-05-26T08:51:00+00:00

Until now the parameter of the ADDR_TIMING_MODE feature was just the ONFI timing mode (from 0 to 5) because we were only supporting the SDR data interface. In the same byte, bits 4 and 5 indicate which data interface is being configured so use them to set the right mode and also read them back to ensure the right timing has been setup on the chip's side. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-17-miquel.raynal@bootlin.com

mtd: rawnand: Add onfi_fill_nvddr_interface_config() helper

2021-05-26T08:43:50+00:00

Same logic as for the SDR path, let's create a onfi_fill_nvddr_interface_config() helper to fill an interface configuration structure with NV-DDR timings, given a specific ONFI mode. There is one additional thing to do compared to SDR mode: tCAD timing can be fast or slow and this depends on an ONFI parameter page bit. By default the slow value is declared in the timings structure definition, but this helper can shrink it down if necessary. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-12-miquel.raynal@bootlin.com

mtd: rawnand: Retrieve NV-DDR timing modes from the ONFI parameter page

2021-05-26T08:43:46+00:00

When parsing the ONFI parameter page, save the available NV-DDR timing modes in the core's dynamic ONFI structure. Once available to the rest of the core out of the ONFI driver, these values will then be used to derive the best timing mode. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-10-miquel.raynal@bootlin.com

mtd: rawnand: Clarify the NV-DDR entries in the ONFI structure

2021-05-26T08:43:42+00:00

Both src_sync_timing_mode and src_ssync_features entries of the ONFI parameter page have been updated and now are named nvddr_timing_modes, nvddr2_timing_modes and nvddr_nvddr2_features, which is much more understandable for someone which do not know the history of the ONFI specification. Update the relevant structure with regard to these changes. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-8-miquel.raynal@bootlin.com

mtd: rawnand: Use more recent ONFI specification wording

2021-05-26T08:43:40+00:00

In particular, first ONFI specifications referred to SDR modes as asynchronous modes, which is not the term we usually have in mind. The spec has then been updated, so do the same here in the NAND subsystem to avoid any possible confusion. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-7-miquel.raynal@bootlin.com

mtd: rawnand: onfi: Use the BIT() macro when possible

2021-05-26T08:43:37+00:00

Update the onfi.h header to use the BIT() macro. Signed-off-by: Miquel Raynal Acked-by: Alexander Dahl Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-5-miquel.raynal@bootlin.com

mtd: rawnand: Move ONFI code to nand_onfi.c

2018-10-03T09:12:25+00:00

This moves ONFI related code to nand_onfi.c and ONFI related struct/macros to include/linux/mtd/onfi.h. Signed-off-by: Boris Brezillon Signed-off-by: Miquel Raynal