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Date: Sat, 15 Jan 2022 15:53:28 +0100 From: Loic Poulain <loic.poulain@...aro.org> To: Ricardo Martinez <ricardo.martinez@...ux.intel.com> Cc: netdev@...r.kernel.org, linux-wireless@...r.kernel.org, kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net, ryazanov.s.a@...il.com, m.chetan.kumar@...el.com, chandrashekar.devegowda@...el.com, linuxwwan@...el.com, chiranjeevi.rapolu@...ux.intel.com, haijun.liu@...iatek.com, amir.hanania@...el.com, andriy.shevchenko@...ux.intel.com, dinesh.sharma@...el.com, eliot.lee@...el.com, ilpo.johannes.jarvinen@...el.com, moises.veleta@...el.com, pierre-louis.bossart@...el.com, muralidharan.sethuraman@...el.com, Soumya.Prakash.Mishra@...el.com, sreehari.kancharla@...el.com Subject: Re: [PATCH net-next v4 00/13] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem On Fri, 14 Jan 2022 at 02:06, Ricardo Martinez <ricardo.martinez@...ux.intel.com> wrote: > > t7xx is the PCIe host device driver for Intel 5G 5000 M.2 solution which > is based on MediaTek's T700 modem to provide WWAN connectivity. > The driver uses the WWAN framework infrastructure to create the following > control ports and network interfaces: > * /dev/wwan0mbim0 - Interface conforming to the MBIM protocol. > Applications like libmbim [1] or Modem Manager [2] from v1.16 onwards > with [3][4] can use it to enable data communication towards WWAN. > * /dev/wwan0at0 - Interface that supports AT commands. > * wwan0 - Primary network interface for IP traffic. > > The main blocks in t7xx driver are: > * PCIe layer - Implements probe, removal, and power management callbacks. > * Port-proxy - Provides a common interface to interact with different types > of ports such as WWAN ports. > * Modem control & status monitor - Implements the entry point for modem > initialization, reset and exit, as well as exception handling. > * CLDMA (Control Layer DMA) - Manages the HW used by the port layer to send > control messages to the modem using MediaTek's CCCI (Cross-Core > Communication Interface) protocol. > * DPMAIF (Data Plane Modem AP Interface) - Controls the HW 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. > * MHCCIF (Modem Host Cross-Core Interface) - Provides interrupt channels > for bidirectional event notification such as handshake, exception, PM and > port enumeration. > > The compilation of the t7xx driver is enabled by the CONFIG_MTK_T7XX config > option which depends on CONFIG_WWAN. > This driver was originally developed by MediaTek. Intel adapted t7xx to > the WWAN framework, optimized and refactored the driver source in close > collaboration with MediaTek. This will enable getting the t7xx driver on > Approved Vendor List for interested OEM's and ODM's productization plans > with Intel 5G 5000 M.2 solution. >From a WWAN framework perspective: Reviewed-by: Loic Poulain <loic.poulain@...aro.org>
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