[v14,0/2] Add support for Loongson-1 NAND

Message

Keguang Zhang March 20, 2025, 10:31 a.m. UTC

Add the driver and dt-binding document for Loongson-1 NAND.

Changes in v14:
- Clean up unnecessary print messages in the driver.
- Some minor related adjustments.
- Link to v13: https://lore.kernel.org/r/[e-mail]

Changes in v13:
- Improve ls1x_nand_check_op() to cover all opcode checks and eliminate redundancy.
- Revert ls1x_nand_exec_op().
- Some minor adjustments.
- Link to v12: https://lore.kernel.org/r/[e-mail]

Changes in v12:
- Add MTD label in the example.
- Use MTD label for mtd->name instead of hardcoded assignment.                                                                                               
- Removed redundant fields addr1_reg and addr2_reg from struct ls1x_nand_op.
- Introduced .set_addr in struct ls1x_nand_host to replace the previous .parse_address,
  and improve its logic using regmap_update_bits() to avoid restoring the row address.
- Improve the logic of ls1x_nand_check_op() to eliminate repetitive checks.
- Add ECC engine type check in ls1x_nand_attach_chip().
- Some minor improvements.
- Link to v11: https://lore.kernel.org/r/[e-mail]

Changes in v11:
- Remove the requirement for 'nand-use-soft-ecc-engine' and 'nand-ecc-algo'.
- Add 'reg-names' to support DMA address.
- Move the DMA address to DT.
- Rename the source file to 'loongson1-nand-controller.c'.
- Improve the logic of ls1x_nand_op_cmd_mapping().
- Improve the logic of ls1x_nand_check_op() to exclude unsupported cases.
- Substitute 'host' for the improper term 'nfc'.
- Some minor fixes and adjustments.
- Link to v10: https://lore.kernel.org/r/[e-mail]

Changes in v10:                                                                                                                                              
- Fix the build error reported by kernel test robot.
  Link: https://lore.kernel.org/oe-kbuild-all/[e-mail]
- Link to v9: https://lore.kernel.org/r/[e-mail]

Changes in v9:
- Change the compatible to 'loongson,ls1*-nand-controller'.
- Rename the dt-binding file to loongson,ls1b-nand-controller.yaml.
- Update MAINTAINERS file accordingly.
- Some minor adjustments.
- Rebasing due to recent upstream changes.
- Link to v8: https://lore.kernel.org/r/[e-mail]

Changes in v8:
- Add a description part.
- Adjust the compatible because the match data for ls1c-nfc differs from ls1b-nfc.
- Mark 'nand-use-soft-ecc-engine' and 'nand-ecc-algo' as mandatory.
- Delete the superfluous blank lines.
- Drop NAND_MONOLITHIC_READ and add support for real subpage read instead.
- Simplify the logic of ls1b_nand_parse_address() and ls1c_nand_parse_address().
- Split ls1x_nand_set_controller() into ls1x_nand_parse_instructions()
  and ls1x_nand_trigger_op().
- Implement ls1x_nand_op_cmd_mapping() to convert the opcodes instead of forcing them.
- Add ls1x_nand_check_op().
- Remove struct ls1x_nand after moving its members to struct ls1x_nfc.
- Add the prefix 'LS1X_' for all registers and their bits.
- Drop the macros: nand_readl() and nand_writel().
- Some minor fixes and improvements.
- Link to v7: https://lore.kernel.org/r/[e-mail]

Changes in v7:
- Rename the file to loongson,ls1b-nfc.yaml
- Rename the Kconfig dependency to LOONGSON1_APB_DMA
- Link to v6: https://lore.kernel.org/r/[e-mail]

Changes in v6:
- Amend Kconfig
- Add the dt-binding document
- Modify nand_read_subpage() to allow subpage read by a single operation
- Add DT support for driver
- Use DT data instead of platform data
- Remove MAX_ID_SIZE
- Remove case NAND_OP_CMD_INSTR in ls1x_nand_set_controller()
- Move ECC configuration to ls1x_nand_attach_chip()
- Rename variable "nand" to "ls1x"
- Rename variable "nc" to "nfc"
- Some minor fixes
- Link to v5: https://lore.kernel.org/all/[e-mail]

Changes in v5:
- Update the driver to fit the raw NAND framework.
- Implement exec_op() instead of legacy cmdfunc().
- Use dma_request_chan() instead of dma_request_channel().
- Some minor fixes and cleanups.

Changes in v4:
- Retrieve the controller from nand_hw_control.

Changes in v3:
- Replace __raw_readl/__raw_writel with readl/writel.
- Split ls1x_nand into two structures:
ls1x_nand_chip and ls1x_nand_controller.

Changes in v2:
- Modify the dependency in Kconfig due to the changes of DMA module.

Signed-off-by: Keguang Zhang <[e-mail]>
---
Keguang Zhang (2):
      dt-bindings: mtd: Add Loongson-1 NAND Controller
      mtd: rawnand: Add Loongson-1 NAND Controller Driver

 .../mtd/loongson,ls1b-nand-controller.yaml         |  72 ++
 MAINTAINERS                                        |   1 +
 drivers/mtd/nand/raw/Kconfig                       |   7 +
 drivers/mtd/nand/raw/Makefile                      |   1 +
 drivers/mtd/nand/raw/loongson1-nand-controller.c   | 838 +++++++++++++++++++++
 5 files changed, 919 insertions(+)
---
base-commit: 73b8c1dbc2508188e383023080ce6a582ff5f279
change-id: 20240316-loongson1-nand-98327d77e0f6

Best regards,