linux-kernel - [PATCH v5 0/4] drivers/soc/litex: support 32-bit subregisters, 64-bit CPUs

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Message-Id: <20201227161320.2194830-1-gsomlo@gmail.com>
Date:   Sun, 27 Dec 2020 11:13:16 -0500
From:   Gabriel Somlo <gsomlo@...il.com>
To:     shorne@...il.com, mholenko@...micro.com, kgugala@...micro.com
Cc:     linux-kernel@...r.kernel.org, pczarnecki@...ernships.antmicro.com,
        f.kermarrec@...il.com, gregkh@...uxfoundation.org, gsomlo@...il.com
Subject: [PATCH v5 0/4] drivers/soc/litex: support 32-bit subregisters, 64-bit CPUs

This series expands on commit 22447a99c97e ("drivers/soc/litex: add LiteX
SoC Controller driver"), adding support for handling both 8- and 32-bit
LiteX CSR (MMIO) subregisters, on both 32- and 64-bit CPUs.

Notes v5:
	- added patch (4/4) taking 'litex_[set|get]_reg()' private
	- additional optimization of [_]litex_set_reg() in 3/4

Notes v4:
	- improved "eloquence" of some 3/3 commit blurb paragraphs
	- fixed instance of "disgusting" comment style :)
	- litex_[get|set]_reg() now using size_t for 'reg_size' argument
	- slightly tighter shift calculation in litex_set_reg()

Notes v3:
	- split into smaller, more self-explanatory patches
	- more detailed commit blurb for "main payload" (3/3) patch
	- eliminate compiler warning on 32-bit architectures

Notes v2:
	- fix typo (s/u32/u64/) in litex_read64().

Notes v1:
	- LITEX_SUBREG_SIZE now provided by Kconfig.
	- it's not LITEX_REG_SIZE, but rather LITEX_SUBREG_ALIGN!
	- move litex_[get|set]_reg() to include/linux/litex.h and mark
	  them as "static inline";
	- redo litex_[read|write][8|16|32|64]() using litex_[get|set]_reg()
	  (compiler should produce code as efficient as hardcoded shifts,
	   but also automatically matching LITEX_SUBREG_SIZE).

Gabriel Somlo (4):
  drivers/soc/litex: move generic accessors to litex.h
  drivers/soc/litex: separate MMIO from subregister offset calculation
  drivers/soc/litex: support 32-bit subregisters, 64-bit CPUs
  drivers/soc/litex: make 'litex_[set|get]_reg()' methods private

 drivers/soc/litex/Kconfig          |  14 ++-
 drivers/soc/litex/litex_soc_ctrl.c |  76 +-------------
 include/linux/litex.h              | 154 +++++++++++++++++++----------
 3 files changed, 119 insertions(+), 125 deletions(-)

-- 
2.26.2