Message-ID: <2e24734d-038c-b937-aeab-8e348a04b827@microchip.com>
Date:   Sun, 19 Jun 2022 18:39:28 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <i.bornyakov@...rotek.ru>, <mdf@...nel.org>, <hao.wu@...el.com>,
        <yilun.xu@...el.com>, <trix@...hat.com>, <corbet@....net>
CC:     <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <linux-fpga@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <system@...rotek.ru>
Subject: Re: [PATCH v20 0/4] Microchip Polarfire FPGA manager

On 17/06/2022 14:48, Ivan Bornyakov wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Add support to the FPGA manager for programming Microchip Polarfire
> FPGAs over slave SPI interface with .dat formatted bitsream image.

btw Ivan,
Do we want to create a maintainers entry for this?
I am happy to either:
- Create a new entry with whatever combination of ourselves as
  maintainers/reviewers.
- Or if you don't want to take that on, you can add the driver
  to the existing PolarFire SoC MAINTAINERS entry probably with
  a rename to "RISC-V/MICROCHIP FPGA SUPPORT" or similar.

Or if you have another suggestion, lmk!
Thanks,
Conor.

> 
> Changelog:
>   v1 -> v2: fix printk formating
>   v2 -> v3:
>    * replace "microsemi" with "microchip"
>    * replace prefix "microsemi_fpga_" with "mpf_"
>    * more sensible .compatible and .name strings
>    * remove unused defines STATUS_SPI_VIOLATION and STATUS_SPI_ERROR
>   v3 -> v4: fix unused variable warning
>     Put 'mpf_of_ids' definition under conditional compilation, so it
>     would not hang unused if CONFIG_OF is not enabled.
>   v4 -> v5:
>    * prefix defines with MPF_
>    * mdelay() -> usleep_range()
>    * formatting fixes
>    * add DT bindings doc
>    * rework fpga_manager_ops.write() to fpga_manager_ops.write_sg()
>      We can't parse image header in write_init() because image header
>      size is not known beforehand. Thus parsing need to be done in
>      fpga_manager_ops.write() callback, but fpga_manager_ops.write()
>      also need to be reenterable. On the other hand,
>      fpga_manager_ops.write_sg() is called once. Thus, rework usage of
>      write() callback to write_sg().
>   v5 -> v6: fix patch applying
>      I forgot to clean up unrelated local changes which lead to error on
>      patch 0001-fpga-microchip-spi-add-Microchip-MPF-FPGA-manager.patch
>      applying on vanilla kernel.
>   v6 -> v7: fix binding doc to pass dt_binding_check
>   v7 -> v8: another fix for dt_binding_check warning
>   v8 -> v9:
>    * add another patch to support bitstream offset in FPGA image buffer
>    * rework fpga_manager_ops.write_sg() back to fpga_manager_ops.write()
>    * move image header parsing from write() to write_init()
>   v9 -> v10:
>    * add parse_header() callback to fpga_manager_ops
>    * adjust fpga_mgr_write_init[_buf|_sg]() for parse_header() usage
>    * implement parse_header() in microchip-spi driver
>   v10 -> v11: include missing unaligned.h to microchip-spi
>      fix error: implicit declaration of function 'get_unaligned_le[16|32]'
>   v11 -> v12:
>    * microchip-spi: double read hw status, ignore first read, because it
>      can be unreliable.
>    * microchip-spi: remove sleep between status readings in
>      poll_status_not_busy() to save a few seconds. Status is polled on
>      every 16 byte writes - that is quite often, therefore
>      usleep_range() accumulate to a considerable number of seconds.
>   v12 -> v13:
>    * fpga-mgr: separate fpga_mgr_parse_header_buf() from
>      fpga_mgr_write_init_buf()
>    * fpga-mgr: introduce FPGA_MGR_STATE_PARSE_HEADER and
>      FPGA_MGR_STATE_PARSE_HEADER_ERR fpga_mgr_states
>    * fpga-mgr: rename fpga_mgr_write_init_sg() to fpga_mgr_prepare_sg()
>      and rework with respect to a new fpga_mgr_parse_header_buf()
>    * fpga-mgr: rework write accounting in fpga_mgr_buf_load_sg() for
>      better clarity
>    * microchip-spi: rename MPF_STATUS_POLL_TIMEOUT to
>      MPF_STATUS_POLL_RETRIES
>    * microchip-spi: add comment about status reading quirk to
>      mpf_read_status()
>    * microchip-spi: rename poll_status_not_busy() to mpf_poll_status()
>      and add comment.
>    * microchip-spi: make if statement in mpf_poll_status() easier to
>      read.
>   v13 -> v14:
>    * fpga-mgr: improvements from Xu Yilun in
>       - fpga_mgr_parse_header_buf()
>       - fpga_mgr_write_init_buf()
>       - fpga_mgr_prepare_sg()
>       - fpga_mgr_buf_load_sg()
>    * fpga-mgr: add check for -EAGAIN from fpga_mgr_parse_header_buf()
>      when called from fpga_mgr_buf_load_mapped()
>    * microchip-spi: remove excessive cs_change from second spi_transfer
>      in mpf_read_status()
>    * microchip-spi: change type of components_size_start,
>      bitstream_start, i from size_t to u32 in mpf_ops_parse_header()
>   v14 -> v15: eliminate memcpy() in mpf_ops_write()
>     Eliminate excessive memcpy() in mpf_ops_write() by using
>     spi_sync_transfer() instead of spi_write().
>   v15 -> v16:
>    * microchip-spi: change back components_size_start and
>      bitstream_start variables types to size_t, i - to u16 in
>      mpf_ops_parse_header()
>    * fpga-mgr: rename fpga_parse_header_buf() to
>      fpga_parse_header_mapped(). It serves only mapped FPGA image now,
>      adjust it accordingly.
>    * fpga-mgr: separate fpga_mgr_parse_header_sg_first() and
>      fpga_mgr_parse_header_sg() from fpga_mgr_prepare_sg()
>   v16 -> v17:
>    * fpga-mgr: return size of allocated header from
>      fpga_mgr_parse_header_sg(), add `char **ret_buf` to function args
>      to save pointer to allocated header. This allow us to call
>      fpga_mgr_write_init_buf() with exact size of allocated header.
>    * document parse_header() callback in fpga-mgr.rst
>   v17 -> v18:
>    * fpga-mgr: change back fpga_mgr_parse_header_sg() to return
>      allocated buffer but set buffer size into output parameter
>    * fpga-mgr: check returned pointer from krealloc for ZERO_OR_NULL_PTR
>      in fpga_mgr_paese_header_sg() as krealloc may return ZERO_SIZE_PTR.
>    * fpga-mgr: in fpga_mgr_prepare_sg() return fpga_mgr_write_init() on
>      fast path only when both initial_header_size and parse_header() are
>      not defined.
>    * docs: fpga-mgr: a few rewords from Xu Yilun
>   v18 -> v19:
>    * microchip-spi: split multiple assignments on a single line in
>      functions mpf_read_status() and mpf_ops_parse_header()
>    * fpga-mgr: add braces {} around "else if" arm in
>      fpga_mgr_prepare_sg()
>    * fpga-mgr: don't reuse krealloc() arg in fpga_mgr_parse_header_sg().
>      If krealloc() returns NULL, it doesn't free the original.
>   v19 -> v20:
>    * fpga-mgr: initialize info->header_size with
>      mops->initial_header_size at fpga_mgr_load().
>    * fpga-mgr: add mops->skip_header boolean flag. Adjust skipping
>      header before write to check against skip_header flag instead of
>      mere presence of info->header_size.
>    * fpga-mgr: split check for ZERO_OR_NULL_PTR() after realloc() in
>      fpga_mgr_parse_header_sg() function to check against zero header +
>      check against NULL returned from realloc().
>    * docs: fpga-mgr: adjust for skip_header flag.
>    * microchip-spi: add skip_header to mpf_ops.
> 
> Ivan Bornyakov (4):
>   fpga: fpga-mgr: support bitstream offset in image buffer
>   docs: fpga: mgr: document parse_header() callback
>   fpga: microchip-spi: add Microchip MPF FPGA manager
>   dt-bindings: fpga: add binding doc for microchip-spi fpga mgr
> 
>  .../fpga/microchip,mpf-spi-fpga-mgr.yaml      |  44 ++
>  Documentation/driver-api/fpga/fpga-mgr.rst    |  27 +-
>  drivers/fpga/Kconfig                          |   8 +
>  drivers/fpga/Makefile                         |   1 +
>  drivers/fpga/fpga-mgr.c                       | 236 +++++++++--
>  drivers/fpga/microchip-spi.c                  | 398 ++++++++++++++++++
>  include/linux/fpga/fpga-mgr.h                 |  22 +-
>  7 files changed, 703 insertions(+), 33 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/fpga/microchip,mpf-spi-fpga-mgr.yaml
>  create mode 100644 drivers/fpga/microchip-spi.c
> 
> --
> 2.25.1
> 
> 

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