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

Hi Loic,

Hi Jack,

On Fri, May 29, 2026 at 12:31 PM Jack Wu via B4 Relay
[off-list ref] wrote:

quoted

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.

quoted

---
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 [off-list ref]

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