[PATCH v2 0/5] mtd: spi-nor: Add support for Octal 8D-8D-8D mode

Mason Yang
2020-04-21T07:08:43Z

Hello,

This is repost of patchset from Boris Brezillon's
[RFC,00/18] mtd: spi-nor: Proposal for 8-8-8 mode support [1].

Background from cover letter for RFC[1].

The trend has been around Octal NOR Flash lately and the latest mainline
already supports 1-1-8 and 1-8-8 modes.

Boris opened a discussion on how we should support stateful modes (X-X-X
and XD-XD-XD, where X is the bus width and D means Double Transfer Rate).

JESD216C has defined specification for Octal 8S-8S-8S and 8D-8D-8D.
Based on JEDEC216C Basic Flash Parameter Table (BFPT) driver extract:
DWORD-18: command and command extension type.
DWORD-19: enable 8S-8S-8S/8D-8D-8D mode sequences by two instructions or
write CFG Reg 2.
DWORD-20: Maximum operation speed of device in Octal mode.

and xSPI profile 1.0 table:
DWORD-1: Read Fast command, the number of dummy cycles and address nbytes
for Read Status Register command.
DWORD-2: Read/Write volatile Register command for CFG Reg2.
DWORD-4 and DWORD-5: dummy cycles used for various frequencies.

The first set of patches is according to JESD216C adding Double Transfer
Rate(DTR) fields, extension command and command bytes number to the
spi_mem_op struct. This is from Boris patchset.

The second set of patches parse the xSPI profile 1.0 table for parameters
needed in Octal 8D-8D-8D mode.

The third set of patches extract BFPT DWORD018,19,20 and define the
relevant macros and enum in spi-nor layer for Octal 8S-8S-8S and
8D-8D-8D mode operation. Parts of these are refer to Boris patchset but
we enable Octal 8D-8D-8D mode in spi_nor_late_init_params() rather than
Boris's adding a change_mode() call-back function.

The last set of patches in the series support Macronix mx25uw51245g
to tweak flash parameters a correct dummy cycles set for various frequency.

Also patched spi-mxic driver for testing on Macronix's Zynq PicoZed board
with Macronix's SPI controller (spi-mxic.c) and mx25uw51245g Octal flash.

[1] https://patchwork.ozlabs.org/cover/982926/

Summary of change log
---------------------
v2:
Parse BFPT & xSPI table for Octal 8D-8D-8D mode parameters and enable Octal
mode in spi_nor_late_init_params().
Using Macros in spi_nor_spimem_read_data, spi_nor_spimem_write_data and
so on by Vignesh comments.

v1:
Without parsing BFPT & xSPI profile 1.0 table and enter Octal 8D-8D-8D
mode directly in spi_nor_fixups hooks.

thnaks for your time and review.
best regards,
Mason

Mason Yang (5):
mtd: spi-nor: Add support for Octal 8D-8D-8D mode
mtd: spi-nor: sfdp: Add support for xSPI profile 1.0 table
mtd: spi-nor: Parse BFPT DWORD-18,19 and 20 for Octal 8D-8D-8D mode
mtd: spi-nor: macronix: Add Octal 8D-8D-8D supports for Macronix
mx25uw51245g
spi: mxic: Patch for Octal 8D-8D-8D mode support

drivers/mtd/spi-nor/core.c | 220 ++++++++++++++++++++++++++++++++++++++--
drivers/mtd/spi-nor/core.h | 31 ++++++
drivers/mtd/spi-nor/macronix.c | 41 ++++++++
drivers/mtd/spi-nor/sfdp.c | 222 ++++++++++++++++++++++++++++++++++++++++-
drivers/mtd/spi-nor/sfdp.h | 16 ++-
drivers/spi/spi-mem.c | 8 +-
drivers/spi/spi-mxic.c | 101 +++++++++++++------
include/linux/mtd/spi-nor.h | 51 +++++++++-
include/linux/spi/spi-mem.h | 13 +++
9 files changed, 654 insertions(+), 49 deletions(-)

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1.9.1