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Message-ID: <pajh2btfch2a5nmjuup4djtv4l3ofref5tjx7ocs7ofwnjfej6@n3gf36v37liz>
Date: Fri, 16 Aug 2024 21:46:07 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: jitendra.vegiraju@...adcom.com
Cc: netdev@...r.kernel.org, alexandre.torgue@...s.st.com,
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Subject: Re: [net-next v4 0/5] net: stmmac: Add PCI driver support for
BCM8958x
Hi Jitendra
On Wed, Aug 14, 2024 at 03:18:13PM -0700, jitendra.vegiraju@...adcom.com wrote:
> From: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>
>
> This patchset adds basic PCI ethernet device driver support for Broadcom
> BCM8958x Automotive Ethernet switch SoC devices.
>
> This SoC device has PCIe ethernet MAC attached to an integrated ethernet
> switch using XGMII interface. The PCIe ethernet controller is presented to
> the Linux host as PCI network device.
>
> The following block diagram gives an overview of the application.
> +=================================+
> | Host CPU/Linux |
> +=================================+
> || PCIe
> ||
> +==========================================+
> | +--------------+ |
> | | PCIE Endpoint| |
> | | Ethernet | |
> | | Controller | |
> | | DMA | |
> | +--------------+ |
> | | MAC | BCM8958X |
> | +--------------+ SoC |
> | || XGMII |
> | || |
> | +--------------+ |
> | | Ethernet | |
> | | switch | |
> | +--------------+ |
> | || || || || |
> +==========================================+
> || || || || More external interfaces
>
> The MAC block on BCM8958x is based on Synopsis XGMAC 4.00a core. This
> MAC IP introduces new DMA architecture called Hyper-DMA for virtualization
> scalability.
>
> Driver functionality specific to new MAC (DW25GMAC) is implemented in
> new file dw25gmac.c.
>
> Management of integrated ethernet switch on this SoC is not handled by
> the PCIe interface.
> This SoC device has PCIe ethernet MAC directly attached to an integrated
> ethernet switch using XGMII interface.
>
> v3->v4:
> Based on Serge's questions, received a confirmation from Synopsis that
> the MAC IP is indeed the new 25GMAC design.
> Renamed all references of XGMAC4 to 25GMAC.
> The patch series is rearranged slightly as follows.
> Patch1 (new): Define HDMA mapping data structure in kernel's stmmac.h
> Patch2 (v3 Patch1): Adds dma_ops for dw25gmac in stmmac core
> Renamed new files dwxgmac4.* to dw25gmac.* - Serge Semin
> Defined new Synopsis version and device id macros for DW25GMAC.
> Coverted bit operations to FIELD_PREP macros - Russell King
> Moved hwif.h to this patch, Sparse flagged warning - Simon Horman
> Defined macros for hardcoded values TDPS etc - Serge Semin
> Read number of PDMAs/VDMAs from hardware - Serge Semin
> Patch3 (v3 Patch2): Hooks in hardware interface handling for dw25gmac
> Resolved user_version quirks questions - Serge, Russell, Andrew
> Added new stmmac_hw entry for DW25GMAC. - Serge
> Added logic to override synopsis_dev_id by glue driver.
> Patch4 (v3 Patch3): Adds PCI driver for BCM8958x device
> Define bitmmap macros for hardcoded values - Andrew Lunn
> Added per device software node - Andrew Lunn
> Patch5(new/split): Adds BCM8958x driver to build system
Thanks for the series update and I'm sorry for abandoning the
v3 discussion. I had to work on another urgent task. I'll get back to
reviewing your patch set on the next week.
-Serge(y)
>
> v2->v3:
> Addressed v2 comments from Andrew, Jakub, Russel and Simon.
> Based on suggestion by Russel and Andrew, added software node to create
> phylink in fixed-link mode.
> Moved dwxgmac4 specific functions to new files dwxgmac4.c and dwxgmac4.h
> in stmmac core module.
> Reorganized the code to use the existing glue logic support for xgmac in
> hwif.c and override ops functions for dwxgmac4 specific functions.
> The patch is split into three parts.
> Patch#1 Adds dma_ops for dwxgmac4 in stmmac core
> Patch#2 Hooks in the hardware interface handling for dwxgmac4
> Patch#3 Adds PCI driver for BCM8958x device
> https://lore.kernel.org/netdev/20240802031822.1862030-1-jitendra.vegiraju@broadcom.com/
>
> v1->v2:
> Minor fixes to address coding style issues.
> Sent v2 too soon by mistake, without waiting for review comments.
> Received feedback on this version.
> https://lore.kernel.org/netdev/20240511015924.41457-1-jitendra.vegiraju@broadcom.com/
>
> v1:
> https://lore.kernel.org/netdev/20240510000331.154486-1-jitendra.vegiraju@broadcom.com/
>
> Jitendra Vegiraju (5):
> Add HDMA mapping for dw25gmac support
> Add basic dw25gmac support to stmmac core
> Integrate dw25gmac into stmmac hwif handling
> Add PCI driver support for BCM8958x
> Add BCM8958x driver to build system
>
> MAINTAINERS | 8 +
> drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 +
> drivers/net/ethernet/stmicro/stmmac/Makefile | 3 +-
> drivers/net/ethernet/stmicro/stmmac/common.h | 2 +
> .../net/ethernet/stmicro/stmmac/dw25gmac.c | 173 ++++++
> .../net/ethernet/stmicro/stmmac/dw25gmac.h | 90 +++
> .../net/ethernet/stmicro/stmmac/dwmac-brcm.c | 530 ++++++++++++++++++
> .../ethernet/stmicro/stmmac/dwxgmac2_dma.c | 31 +
> drivers/net/ethernet/stmicro/stmmac/hwif.c | 25 +-
> drivers/net/ethernet/stmicro/stmmac/hwif.h | 1 +
> drivers/net/ethernet/stmicro/stmmac/stmmac.h | 1 +
> include/linux/stmmac.h | 50 ++
> 12 files changed, 922 insertions(+), 3 deletions(-)
> create mode 100644 drivers/net/ethernet/stmicro/stmmac/dw25gmac.c
> create mode 100644 drivers/net/ethernet/stmicro/stmmac/dw25gmac.h
> create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-brcm.c
>
> --
> 2.34.1
>
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