netdev - [PATCH v2 0/1] can: esd: add support for esd GmbH PCIe/402 CAN interface family

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Date:   Fri, 30 Jul 2021 19:38:04 +0200
From:   Stefan Mätje <Stefan.Maetje@....eu>
To:     linux-can@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>,
        Wolfgang Grandegger <wg@...ndegger.com>
Cc:     netdev@...r.kernel.org,
        Stefan Mätje <Stefan.Maetje@....eu>
Subject: [PATCH v2 0/1] can: esd: add support for esd GmbH PCIe/402 CAN interface family

The purpose of this patch is to introduce a new CAN driver to support
the esd GmbH 402 family of CAN interface boards. The hardware design
is based on a CAN controller implemented in a FPGA attached to a
PCIe link.

More information on these boards can be found following the links
included in the commit message.

This patch supports all boards but will operate the CAN-FD capable
boards only in Classic-CAN mode. The CAN-FD support will be added
when the initial patch has stabilized.

The patch is based on the linux-can-next testing branch.

The patch is uses the previous work of my former colleague:
Link: https://lore.kernel.org/linux-can/1426592308-23817-1-git-send-email-thomas.koerper@esd.eu/

*Note*: scripts/checkpatch.pl still emits the following warnings:
1.esd402_pci.c:293: Still prints the non-hashed virtual address for
  debug purposes with pci_err(). This is done only on fatal
  initialization failure during modprobe and seems sensible in this
  case to debug the error. This will never occur in normal operation.
2.esdacc.h:269: The irq_cnt pointer is still declared volatile and
  this has a reason and is explained in detail in the header
  referencing the exception noted in volatile-considered-harmful.rst.

Changes in v2:
- Avoid warning triggered by -Wshift-count-overflow on architectures
  with 32-bit dma_addr_t.
- Fixed Makefile not to build the kernel module always. Doing this
  renamed esd402_pci.c to esd_402_pci-core.c as recommended by Marc.

Stefan Mätje (1):
  can: esd: add support for esd GmbH PCIe/402 CAN interface family

 drivers/net/can/Kconfig                |   1 +
 drivers/net/can/Makefile               |   1 +
 drivers/net/can/esd/Kconfig            |  12 +
 drivers/net/can/esd/Makefile           |   7 +
 drivers/net/can/esd/esd_402_pci-core.c | 530 ++++++++++++++++++
 drivers/net/can/esd/esdacc.c           | 717 +++++++++++++++++++++++++
 drivers/net/can/esd/esdacc.h           | 394 ++++++++++++++
 7 files changed, 1662 insertions(+)
 create mode 100644 drivers/net/can/esd/Kconfig
 create mode 100644 drivers/net/can/esd/Makefile
 create mode 100644 drivers/net/can/esd/esd_402_pci-core.c
 create mode 100644 drivers/net/can/esd/esdacc.c
 create mode 100644 drivers/net/can/esd/esdacc.h

base-commit: 8dad5561c13ade87238d9de6dd410b43f7562447
-- 
2.25.1