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Subject[PATCH v3 0/9] BCMA support for brcmnand
Date
Hi all,

This patch series adds support for the BRCMNAND controller revision 3.4
embedded in MIPS-based SoCs such as 5357, typically found in the Netgear
WNR3500L v2 and other kinds of Wi-Fi routers. The upstream platform that
uses this controller is under arch/mips/bcm47xx/ and does not use Device
Tree (and probably never will by now). BCMA (Broadcom AMBA) is a special
kind of discoverable memory mapped interface which requires the use of
special accessors to read from/write to the hardware block.

The integration of brcmnand into that SoC is a bit quirky in that every
register offering byte level data about the flash (OOB, device ID, etc.)
requires byte swapping. The command shift should also have been 24, but
is in fact 0, took me a while to understand why no reads were actually
working because of that.

This has been tested with Linux 5.10.82 and Linus' master with OpenWrt
and confirmed that the squashfs + jffs2 overlay that OpenWrt creates is
entirely functional and that written data is made persistent.

Changes in v3:

- fixed a few typo/grammar errors in the commit messages, mention when
changes are non functional changes
- removed the stray hunk in 2 to enable the static key

Changes in v2:

- re-ordered the patch such that the soc variable is initialized as
early as possible
- corrected bug in the conversion of brcmnand_init_cs() which
incorrectly used the wrong device_node variable (parent instead of
child)
- took Andy's feedback to make the test for a valid interrupt to be > 0
while calling platform_get_irq_optional()
- utilized static branch (disabled by default) and conditional
compilation and confirm with disassembly that the generated code is
as efficient as before if not enabling the BCMA shim and as efficient
as possible if enabling BCMA shim
- updated BCMA shim driver descriptor, author and added helper function
to encapsulate the container_of usage
- added comment to explain why a slightly different platform device name
is used for the 5357-style NAND controller

Florian Fainelli (9):
mtd: rawnand: brcmnand: Assign soc as early as possible
mtd: rawnand: brcmnand: Allow SoC to provide I/O operations
mtd: rawnand: brcmnand: Avoid pdev in brcmnand_init_cs()
mtd: rawnand: brcmnand: Move OF operations out of brcmnand_init_cs()
mtd: rawnand: brcmnand: Allow working without interrupts
mtd: rawnand: brcmnand: Add platform data structure for BCMA
mtd: rawnand: brcmnand: Allow platform data instantation
mtd: rawnand: brcmnand: BCMA controller uses command shift of 0
mtd: rawnand: brcmnand: Add BCMA shim

MAINTAINERS | 1 +
drivers/bcma/driver_chipcommon_nflash.c | 20 ++-
drivers/mtd/nand/raw/Kconfig | 13 ++
drivers/mtd/nand/raw/brcmnand/Makefile | 2 +
drivers/mtd/nand/raw/brcmnand/bcma_nand.c | 132 ++++++++++++++++
drivers/mtd/nand/raw/brcmnand/brcmnand.c | 160 +++++++++++++-------
drivers/mtd/nand/raw/brcmnand/brcmnand.h | 29 ++++
include/linux/bcma/bcma_driver_chipcommon.h | 5 +
include/linux/platform_data/brcmnand.h | 12 ++
9 files changed, 321 insertions(+), 53 deletions(-)
create mode 100644 drivers/mtd/nand/raw/brcmnand/bcma_nand.c
create mode 100644 include/linux/platform_data/brcmnand.h

--
2.25.1

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