can: mcp251xfd: ethtool: add support

This patch adds basic ethtool support (to query the current and
maximum ring parameters) to the driver.

Link: https://lore.kernel.org/20220313083640.501791-5-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: ram: add helper function for runtime ring size calculation

This patch adds a helper function to calculate the ring configuration
of the controller based on various constraints, like available RAM,
size of RX and TX objects, CAN-mode, number of FIFOs and FIFO depth.

Link: https://lore.kernel.org/20220313083640.501791-3-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: move ring init into separate function

This patch moves the ring initialization from the mcp251xfd core file
into a separate one to make the driver a bit more orderly.

Link: https://lore.kernel.org/all/20220105154300.1258636-13-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: move chip FIFO init into separate file

This patch moves the chip FIFO initialization from the mcp251xfd core
file into a separate one to make the driver a bit more orderly.

Link: https://lore.kernel.org/all/20220105154300.1258636-12-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: move TEF handling into separate file

This patch moves the TEF handling from the mcp251xfd core file into a
separate one to make the driver a bit more orderly.

Link: https://lore.kernel.org/all/20220105154300.1258636-11-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: move TX handling into separate file

This patch moves the TX handling from the mcp251xfd core file into a
separate one to make the driver a bit more orderly.

Link: https://lore.kernel.org/all/20220105154300.1258636-10-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: move RX handling into separate file

This patch moves the RX handling from the mcp251xfd core file into a
separate one to make the driver a bit more orderly.

Link: https://lore.kernel.org/all/20220105154300.1258636-9-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: add HW timestamp infrastructure

This patch add the HW timestamping infrastructure. The mcp251xfd has a
free running timer of 32 bit width, running at max 40MHz, which wraps
around every 107 seconds. The current timestamp is latched into RX and
TEF objects automatically be the CAN controller.

This patch sets up a cyclecounter, timecounter and delayed worker
infrastructure (which runs every 45 seconds) to convert the timer into
a proper 64 bit based ns timestamp.

Link: https://lore.kernel.org/r/20210304160328.2752293-6-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: add dev coredump support

For easier debugging this patch adds dev coredump support to the
driver. A dev coredump is generated in case the chip fails to start or
an error in the interrupt handler is detected.

The dev coredump consists of all chip registers and chip memory, as
well as the driver's internal state of the TEF-, RX- and TX-FIFOs, it
can be analyzed with the mcp251xfd-dump tool of the can-utils:

https://github.com/linux-can/can-utils/tree/master/mcp251xfd
Link: https://lore.kernel.org/r/20210304160328.2752293-2-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: rename all user facing strings to mcp251xfd

In [1] Geert noted that the autodetect compatible for the mcp25xxfd driver,
which is "microchip,mcp25xxfd" might be too generic and overlap with upcoming,
but incompatible chips.

In the previous patch the autodetect DT compatbile has been renamed to
"microchip,mcp251xfd", this patch changes all user facing strings from
"mcp25xxfd" to "mcp251xfd" and "MCP25XXFD" to "MCP251XFD", including:
- kconfig symbols
- name of kernel module
- DT and SPI compatible

[1] http://lore.kernel.org/r/CAMuHMdVkwGjr6dJuMyhQNqFoJqbh6Ec5V2b5LenCshwpM2SDsQ@mail.gmail.com

Link: https://lore.kernel.org/r/20200930091424.792165-9-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

can: mcp251xfd: rename driver files and subdir to mcp251xfd

In [1] Geert noted that the autodetect compatible for the mcp25xxfd driver,
which is "microchip,mcp25xxfd" might be too generic and overlap with upcoming,
but incompatible chips.

In the previous patch the autodetect DT compatbile has been renamed to
"microchip,mcp251xfd", this patch changes the name of the driver subdir and the
individual files accordinly.

[1] http://lore.kernel.org/r/CAMuHMdVkwGjr6dJuMyhQNqFoJqbh6Ec5V2b5LenCshwpM2SDsQ@mail.gmail.com

Link: https://lore.kernel.org/r/20200930091424.792165-8-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>