RE: [External Mail] Re: [PATCH 00/11] net: wwan: t9xx: Add MediaTek T9XX WWAN driver

["Wu. JackBB (GSM)" <JackBB_Wu@compal.com>]

Hi Loic,

>
> Hi Jack,
>
> On Fri, May 29, 2026 at 12:31 PM Jack Wu via B4 Relay
> <devnull+jackbb_wu.compal.com@kernel.org> wrote:
> >
> > T9XX is the PCIe host device driver for MediaTek's
> > t900 modem. The driver uses the WWAN framework
> > infrastructure to create the following control ports
> > and network interfaces for data transactions.
> > * /dev/wwan0at0 - Interface that supports AT commands.
> > * /dev/wwan0mbim0 - Interface conforming to the MBIM
> > protocol.
> > * wwan0-X - Primary network interface for IP traffic.
> >
> > The main blocks in the T9XX driver are:
> > * HW layer - Abstracts the hardware bus operations for
> > the device, and provides generic interfaces for the
> > transaction layer to get the device's information and
> > control the device's behavior. It includes:
> >
> > * PCIe - Implements probe, removal and interrupt
> > handling.
> > * MHCCIF (Modem Host Cross-Core Interface) - Provides
> > interrupt channels for bidirectional event
> > notification such as handshake and port enumeration.
> >
> > * Transaction layer - Implements data transactions for
> > the control plane and the data plane. It includes:
> >
> > * DPMAIF (Data Plane Modem AP Interface) - Controls
> > the hardware that provides uplink and downlink
> > queues for the data path. The data exchange takes
> > place using circular buffers to share data buffer
> > addresses and metadata to describe the packets.
> > * CLDMA (Cross Layer DMA) - Manages the hardware
> > used by the port layer to send control messages to
> > the device using MediaTek's CCCI (Cross-Core
> > Communication Interface) protocol.
> > * TX Services - Dispatch packets from the port layer
> > to the device.
> > * RX Services - Dispatch packets to the port layer
> > when receiving packets from the device.
> >
> > * Port layer - Provides control plane and data plane
> > interfaces to userspace. It includes:
> >
> > * Control Plane - Provides device node interfaces
> > for controlling data transactions.
> > * Data Plane - Provides network link interfaces
> > wwanX (0, 1, 2...) for IP data transactions.
> >
> > * Core logic - Contains the core logic to keep the
> > device working. It includes:
> >
> > * FSM (Finite State Machine) - Monitors the state
> > of the device, and notifies each module when the
> > state changes.
> >
> > The compilation of the T9XX driver is enabled by the
> > CONFIG_MTK_T9XX and CONFIG_MTK_T9XX_PCI config option
> > which depends on CONFIG_WWAN.
>
> Can you specify which userspace counterpart you need (e.g., a
> ModemManager version or a link to the relevant patch series)?
>
The driver is agnostic to the userspace application. We verified
functionality using ModemManager v1.23.4 and v1.25.95, and both
work out of the box.
>
> >
> > ---
> > Jack Wu (11):
> > net: wwan: t9xx: Add PCIe core
> > net: wwan: t9xx: Add control plane transaction layer
> > net: wwan: t9xx: Add control DMA interface
> > net: wwan: t9xx: Add control port
> > net: wwan: t9xx: Add FSM thread
> > net: wwan: t9xx: Add AT & MBIM WWAN ports
> > net: wwan: t9xx: Introduce data plane hardware
> > net: wwan: t9xx: Add data plane transaction layer
> > net: wwan: t9xx: Introduce WWAN interface
> > net: wwan: t9xx: Add power management support
> > net: wwan: t9xx: Add maintainers and documentation
> >
> > .../networking/device_drivers/wwan/t9xx.rst | 48 +
> > MAINTAINERS | 10 +
> > drivers/net/wwan/Kconfig | 17 +
> > drivers/net/wwan/Makefile | 1 +
> > drivers/net/wwan/t9xx/Makefile | 16 +
> > drivers/net/wwan/t9xx/mtk_ctrl_plane.c | 95 +
> > drivers/net/wwan/t9xx/mtk_ctrl_plane.h | 88 +
> > drivers/net/wwan/t9xx/mtk_data_plane.c | 104 +
> > drivers/net/wwan/t9xx/mtk_data_plane.h | 105 +
> > drivers/net/wwan/t9xx/mtk_dev.c | 55 +
> > drivers/net/wwan/t9xx/mtk_dev.h | 114 +
> > drivers/net/wwan/t9xx/mtk_fsm.c | 931 +++++++
> > drivers/net/wwan/t9xx/mtk_fsm.h | 140 +
> > drivers/net/wwan/t9xx/mtk_port.c | 967 +++++++
> > drivers/net/wwan/t9xx/mtk_port.h | 176 ++
> > drivers/net/wwan/t9xx/mtk_port_io.c | 576 +++++
> > drivers/net/wwan/t9xx/mtk_port_io.h | 41 +
> > drivers/net/wwan/t9xx/mtk_utility.h | 33 +
> > drivers/net/wwan/t9xx/mtk_wwan.c | 475 ++++
> > drivers/net/wwan/t9xx/mtk_wwan.h | 17 +
> > drivers/net/wwan/t9xx/pcie/Makefile | 19 +
> > drivers/net/wwan/t9xx/pcie/mtk_cldma.c | 1527 +++++++++++
> > drivers/net/wwan/t9xx/pcie/mtk_cldma.h | 176 ++
> > drivers/net/wwan/t9xx/pcie/mtk_cldma_drv.c | 373 +++
> > drivers/net/wwan/t9xx/pcie/mtk_cldma_drv.h | 174 ++
> > drivers/net/wwan/t9xx/pcie/mtk_cldma_drv_m9xx.c | 177 ++
> > drivers/net/wwan/t9xx/pcie/mtk_cldma_drv_m9xx.h | 101 +
> > drivers/net/wwan/t9xx/pcie/mtk_ctrl_cfg_m9xx.c | 55 +
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif.c | 2714 ++++++++++++++++++++
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif.h | 16 +
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif_drv.c | 1586 ++++++++++++
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif_drv.h | 268 ++
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif_drv_m9xx.c | 687 +++++
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif_reg.h | 387 +++
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif_reg_m9xx.h | 37 +
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif_ring.c | 168 ++
> > drivers/net/wwan/t9xx/pcie/mtk_dpmaif_ring.h | 161 ++
> > drivers/net/wwan/t9xx/pcie/mtk_pci.c | 1067 ++++++++
> > drivers/net/wwan/t9xx/pcie/mtk_pci.h | 219 ++
> > drivers/net/wwan/t9xx/pcie/mtk_pci_drv_m9xx.c | 70 +
> > drivers/net/wwan/t9xx/pcie/mtk_pci_reg.h | 72 +
> > drivers/net/wwan/t9xx/pcie/mtk_trans_ctrl.c | 593 +++++
> > drivers/net/wwan/t9xx/pcie/mtk_trans_ctrl.h | 105 +
> > 43 files changed, 14761 insertions(+)
> > ---
> > base-commit: eb3f4b7426cfd2b79d65b7d37155480b32259a11
> > change-id: 20260529-t9xx_driver_v1-1744f8af7739
> >
> > Best regards,
> > --
> > Jack Wu <jackbb_wu@compal.com>


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