Date:   Mon, 24 Oct 2022 10:38:58 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Daniel Kestrel <kestrelseventyfour@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/3] Add support for WASP SoC on AVM router boards

Hi Daniel,

I have started to review this patchset.  I expect the process to take several
days and will clearly let you know when I am done.

Thanks,
Mathieu

On Thu, Aug 04, 2022 at 11:08:03PM +0200, Daniel Kestrel wrote:
> There is a popular set of Lantiq xrx200 router boards by AVM in
> Germany (AVM Fritzbox 3390, 3490, 5490, 5491 and 7490) which
> have the strange implementation of having the wifi cards
> connected to a separate memory only ATH79 based SoC. It has no
> persistent storage and no access to any resource on the Lantiq
> host, but is connect to the Lantiq GSWIP switch on an additional
> fixed internal network port.
> This kernel module is to support booting the secondary SoC called
> Wireless Assistant Support Processor (WASP).
> After turning it on, a small network boot firmware is sent to
> the SoC by using mdio and when it is started, an initramfs
> linux image is sent to the SoC using raw ethernet frames.
> 
> The whole procedure takes about 6 seconds, if there is no error.
> So far tested on 3490, 5490 and 7490 devices based on OpenWrt, 3390
> takes about 20 seconds.
> 
> Patch 1/3 adds the vendor name
> Patch 2/3 adds the dt-bindings
> Patch 3/3 adds the remoteproc driver
> 
> To build and run, there is OpenWrt PR 5075.
> 
> Please review.
> 
> Changes in v5:
>   - Replace names for properties and descriptions as requested in the
>     device tree documentation and change the driver to accept them
>   - Change example in the device tree documentation
>   - Restructure constants and defines in the beginning of the driver
>     source for better readability
>   - Combine m_start_addr and m_exec_addr into a single constant and
>     change avm_wasp_netboot_write_header to use only this one constant
>   - Change variable startup_gpio to power_gpio in driver
> 
> Changes in v4:
>   - Fix compiler warnings with W=2 option
> 
> Changes in v3:
>   - Replace generic avm,fritzboxx490-wasp with actual device names for
>     device tree documentation and change the driver to accept them
>   - Add maxItems to device tree documentation
>   - Change example in the device tree documentation
>   - Fix wait time to make the Wasp upload work for 3390 more reliable
>   - Enable the SOC on driver load, use reset instead of disable/enable
>     while driver is loaded and disable on unloading the driver
>   - Change some messages printed to adhere to standards (e.g. remove !)
> 
> Changes in v2:
>   - Remove firmware names from dt-binding and add as kmod parameters
>   - Rename other bindings with vender prefix and fix gpios suffix
>   - Change descriptions in dt-binding
>   - Replace/Remove asynch load of firmware with request_firmware_direct
>   - Fix comments to use the errno define instead of the number
>   - Implement wait loops with read_poll_timeout() macro
>   - Wrap read_poll_timeout() macro in function saving 6k module size
>   - Return -ETIMEDOUT for all errors returned by read_poll_timeout
>   - Replace mdio writes/reads with mdiobus_write and mdiobus_read and add
>     return codes and their handling
>   - Remove mutex for mdiobus_lock and add return code checking for mdio ops
>   - Replaced the mdio register array with directly specifying registers
>   - As a result of the previous 3 changes remove the functions for mdio
>   - Consolidate error messages for mdio writes into a single one saved 1k
>     for module size
>   - Replaced mdelay with usleep_range saved 0,7k module size
>   - Remove unneeded include <linux/interrupt.h> and <linux/error.h>
>   - Wrap all blocks with {} and fix some indentation errors
>   - Change const len in to size_t in avm_wasp_netboot_write_chunk
>   - Make all methods static to fix kernel bot warning
>   - Change read variable name in avm_wasp_load_initramfs_image
>   - Change ssize_t variables to size_t in avm_wasp_load_initramfs_image
>   - avm_wasp_netboot_write_chunk change for loop for 2 byte divisibility
>   - Change uint32_t to u32
>   - Change int count = -1 to u32 with U32_MAX initialisation
>   - Add check for firmware len divisable by 4
>   - Replace big endian bit shift operations with be32_to_cpu
>   - Change loop to write 14 byte firmware chuncks like suggested
>   - Change WASP_CHUNK_SIZE to ARRAY_SIZE(mac_data) for readability
>   - Change int done to boolean
>   - Change unsigned ints to u32
>   - Change int to size_t for send_len
>   - Use int for numbytes because kernel_recvmsg returns error or number
>   - Two sockets are not needed, so reduce to one socket usage
>   - Remove struct timeval definition, replace with __kernel_old_timeval
>   - __kernel_old_timeval is depracated, but arch mips is 32bit platform
>   - Replace &avmwasp->pdev->dev with local dev
>   - Check if wasp network interface is up and fail if not in start method
>   - Remove setsockopt for SO_REUSEADDR and SO_BINDTODEVICE
>   - Remove packet_counter
>   - Move firmware and firmware_end out of RESP_DISCOVER to make sure that
>     they are initialized if RESP_DISCOVER is not happening first
>   - indend break;
>   - Move second half of the send/receive paket while loop to RESP_OK and
>     let RESP_DISCOVER fall through
>   - Remove bringing up the wasp network interface
>   - Check if wasp network interface is up in probe and defer if not
>   - Remove the check for the root device and replace it with match data
>     for WASP device identification
>   - Move of_read and find of mdio bus to rproc_start but delete reference
>     after using it in the rproc_start method
>   - Replace dev_set_drvdata with platform_set_drvdata
>   - Remove avm_wasp_rproc_boot_addr because its not needed and move
>     setting the fw struct pointer to avm_wasp_rproc_load
>   - Move avm_wasp.h definitions to kernel module
> 
> Reported-by: kernel test robot <lkp@...el.com>
> 
> Daniel Kestrel (3):
>   dt-bindings: vendor-prefixes: Add AVM
>   dt-bindings: remoteproc: Add AVM WASP
>   remoteproc: Add AVM WASP driver
> 
>  .../bindings/remoteproc/avm,wasp-rproc.yaml   |   61 +
>  .../devicetree/bindings/vendor-prefixes.yaml  |    2 +
>  drivers/remoteproc/Kconfig                    |   10 +
>  drivers/remoteproc/Makefile                   |    1 +
>  drivers/remoteproc/avm_wasp.c                 | 1051 +++++++++++++++++
>  5 files changed, 1125 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/avm,wasp-rproc.yaml
>  create mode 100644 drivers/remoteproc/avm_wasp.c
> 
> -- 
> 2.17.1
> 

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