[RFC,00/10] PRU-ICSSM Ethernet Driver

Hi,

The Programmable Real-Time Unit Industrial Communication Sub-system (PRU-ICSS)
is available on the TI SOCs in two flavors: Gigabit ICSS (ICSSG) and the older
Megabit ICSS (ICSSM).

Support for ICSSG Dual-EMAC mode has already been mainlined [1] and the
fundamental components/drivers such as PRUSS driver, Remoteproc driver,
PRU-ICSS INTC, and PRU-ICSS IEP drivers are already available in the mainline
Linux kernel. The current RFC patch series builds on top of these components
and introduces changes to support the Dual-EMAC mode on ICSSM, especially on
the TI AM57xx devices.


TI AM57xx series of devices have two identical PRU-ICSS instances (PRU-ICSS1
and PRU-ICSS2), each with two 32-bit RISC PRU cores. Each PRU core has
(a) dedicated Ethernet interface (MII, MDIO), timers, capture modules, and
serial communication interfaces, and (b) dedicated data and instruction RAM as
well as shared RAM for inter PRU communication within the PRU-ICSS.

This set of patches is a follow-up to [2]. These patches add support for the
following features::
- RX and TX over PRU Ethernet ports in Dual-EMAC mode
- VLAN Filtering
- Multicast Filtering
- Promiscuous mode
- Storm prevention  
- Interrupt coalescing
- Linux PTP (ptp4l) Ordinary clock

Further, note that these are the first set of patches for PRU-ICSS2 Ethernet.
Switch mode support, PRU-ICSS1 support, PRU Ethernet for AM437x and AM335x in
Dual-EMAC and Switch mode support with full feature set changes will be posted
subsequently.

These changes are validated on top of Linux next kernel by reverting a recent
commit [3]. This commit is breaking the Ethernet functionality on TI AM57xx
due to zero block size allocation in SRAM during initialization. We are
following up on commit [3] in a separate thread to find a resolution.

The patches presented in this series have gone through the patch verification
tools and no warnings or errors are reported. Sample test logs verifying the
functionality on Linux next kernel are available here:


[Interface up Testing](https://gist.github.com/basharath-cit/d845969ab300e9fbd327b09498b27790)

[Ping Testing](https://gist.github.com/basharath-cit/12391ea30bb75b02cc7cfb7bc4678b01)

[Iperf Testing](https://gist.github.com/basharath-cit/b27095917fef2fc6b437ada9f4262042)

[1] https://lore.kernel.org/all/20230106121046.886863-1-danishanwar@ti.com/
[2] https://lore.kernel.org/all/20241223135550.6898-1-basharath@couthit.com/
[3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.13-rc5&id=1a52a094c2f0821860d9ce15fffe01103a146f1f


Thanks & Best Regards,
Basharath

Murali Karicheri (1):
  net: ti: prueth: Adds support for RX interrupt coalescing/pacing

Parvathi Pudi (1):
  dt-bindings: net: ti: Adds device tree binding for DUAL-EMAC mode
    support on PRU-ICSS2 for AM57xx SOCs

Roger Quadros (8):
  net: ti: prueth: Adds ICSSM Ethernet driver
  net: ti: prueth: Adds PRUETH HW and SW configuration
  net: ti: prueth: Adds link detection, RX and TX support.
  net: ti: prueth: Adds ethtool support for ICSSM PRUETH Driver
  net: ti: prueth: Adds HW timestamping support for PTP using PRU-ICSS
    IEP module
  net: ti: prueth: Adds support for network filters for traffic control
    supported by PRU-ICSS
  net: ti: prueth: Adds power management support for PRU-ICSS
  arm: dts: ti: Adds device tree nodes for PRU Cores, IEP and eCAP
    modules of PRU-ICSS2 Instance.

 .../devicetree/bindings/net/ti,icss-iep.yaml  |    6 +
 .../bindings/net/ti,icssm-prueth.yaml         |  153 ++
 .../bindings/net/ti,pruss-ecap.yaml           |   32 +
 .../devicetree/bindings/soc/ti/ti,pruss.yaml  |    9 +
 arch/arm/boot/dts/ti/omap/am57-pruss.dtsi     |   11 +
 arch/arm/boot/dts/ti/omap/am571x-idk.dts      |    8 +-
 arch/arm/boot/dts/ti/omap/am572x-idk.dts      |   10 +-
 arch/arm/boot/dts/ti/omap/am574x-idk.dts      |   10 +-
 .../boot/dts/ti/omap/am57xx-idk-common.dtsi   |   63 +
 drivers/net/ethernet/ti/Kconfig               |   24 +
 drivers/net/ethernet/ti/Makefile              |    5 +
 drivers/net/ethernet/ti/icssg/icss_iep.c      |   42 +
 drivers/net/ethernet/ti/icssg/icssg_mii_rt.h  |    6 +
 drivers/net/ethernet/ti/icssm/icssm_ethtool.c |  306 +++
 drivers/net/ethernet/ti/icssm/icssm_prueth.c  | 2421 +++++++++++++++++
 drivers/net/ethernet/ti/icssm/icssm_prueth.h  |  424 +++
 .../net/ethernet/ti/icssm/icssm_prueth_dos.c  |  225 ++
 .../net/ethernet/ti/icssm/icssm_prueth_ecap.c |  312 +++
 .../net/ethernet/ti/icssm/icssm_prueth_ecap.h |   47 +
 .../net/ethernet/ti/icssm/icssm_prueth_ptp.h  |   85 +
 drivers/net/ethernet/ti/icssm/icssm_switch.h  |  285 ++
 .../ti/icssm/icssm_vlan_mcast_filter_mmap.h   |  120 +
 22 files changed, 4595 insertions(+), 9 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/ti,icssm-prueth.yaml
 create mode 100644 Documentation/devicetree/bindings/net/ti,pruss-ecap.yaml
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_ethtool.c
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth.c
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth.h
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_dos.c
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_ecap.c
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_ecap.h
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_prueth_ptp.h
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_switch.h
 create mode 100644 drivers/net/ethernet/ti/icssm/icssm_vlan_mcast_filter_mmap.h