Date:   Sat, 21 Jan 2023 19:03:58 +0530
From:   m.chetan.kumar@...ux.intel.com
To:     netdev@...r.kernel.org
Cc:     kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
        ryazanov.s.a@...il.com, loic.poulain@...aro.org,
        ilpo.jarvinen@...ux.intel.com, ricardo.martinez@...ux.intel.com,
        chiranjeevi.rapolu@...ux.intel.com, haijun.liu@...iatek.com,
        edumazet@...gle.com, pabeni@...hat.com,
        chandrashekar.devegowda@...el.com, m.chetan.kumar@...ux.intel.com,
        linuxwwan@...el.com, linuxwwan_5g@...el.com, corbet@....net,
        linux-doc@...r.kernel.org, jiri@...dia.com
Subject: [PATCH v5 net-next 5/5] net: wwan: t7xx: Devlink documentation

From: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>

Document the t7xx devlink commands usage for firmware flashing &
coredump collection.

Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@...el.com>
--
v5:
 * No Change.
v4:
 * Spell out fw as firmware.
 * Drop "Refer to t7xx.rst file for details" in commit message.
 * Move explanation below commands under flash update.
 * Move firmware image type list under flash commands.
 * Keyword formatting.
 * Trim the unneeded trailing colon.
 * Describe region commands.
v3:
 * No change.
v2:
 * Documentation correction.
 * Add param details.
---
 Documentation/networking/devlink/index.rst |   1 +
 Documentation/networking/devlink/t7xx.rst  | 224 +++++++++++++++++++++
 2 files changed, 225 insertions(+)
 create mode 100644 Documentation/networking/devlink/t7xx.rst

diff --git a/Documentation/networking/devlink/index.rst b/Documentation/networking/devlink/index.rst
index fee4d3968309..0c4f5961e78f 100644
--- a/Documentation/networking/devlink/index.rst
+++ b/Documentation/networking/devlink/index.rst
@@ -66,3 +66,4 @@ parameters, info versions, and other features it supports.
    prestera
    iosm
    octeontx2
+   t7xx
diff --git a/Documentation/networking/devlink/t7xx.rst b/Documentation/networking/devlink/t7xx.rst
new file mode 100644
index 000000000000..dc795c8cc851
--- /dev/null
+++ b/Documentation/networking/devlink/t7xx.rst
@@ -0,0 +1,224 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+====================
+t7xx devlink support
+====================
+
+This document describes the devlink features implemented by the ``t7xx``
+device driver.
+
+Parameters
+==========
+The ``t7xx_driver`` driver implements the following driver-specific parameters.
+
+.. list-table:: Driver-specific parameters
+   :widths: 5 5 5 85
+
+   * - Name
+     - Type
+     - Mode
+     - Description
+   * - ``fastboot``
+     - boolean
+     - driverinit
+     - Set this param to enter fastboot mode.
+
+Flash Update
+============
+
+The ``t7xx`` driver implements the flash update using the ``devlink-flash``
+interface.
+
+The driver uses ``DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT`` to identify the type of
+firmware image that need to be programmed upon the request by user space application.
+
+``t7xx`` driver uses fastboot protocol for firmware flashing. In the firmware
+flashing procedure, fastboot command & response are exchanged between driver
+and wwan device.
+
+::
+
+  $ devlink dev reload pci/0000:$bdf action driver_reinit
+
+The wwan device is put into fastboot mode via devlink reload command, by
+passing ``driver_reinit`` action.
+
+::
+
+  $ devlink dev reload pci/0000:$bdf action fw_activate
+
+Upon completion of firmware flashing or coredump collection the wwan device is
+reset to normal mode using devlink reload command, by passing ``fw_activate``
+action.
+
+Flash Commands
+--------------
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file preloader_k6880v1_mdot2_datacard.bin component "preloader"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file loader_ext-verified.img component "loader_ext1"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file tee-verified.img component "tee1"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file lk-verified.img component "lk"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file spmfw-verified.img component "spmfw"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file sspm-verified.img component "sspm_1"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file mcupm-verified.img component "mcupm_1"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file dpm-verified.img component "dpm_1"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file boot-verified.img component "boot"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file root.squashfs component "rootfs"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file modem-verified.img component "md1img"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file dsp-verified.bin component "md1dsp"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file OP_OTA.img component "mcf1"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file OEM_OTA.img component "mcf2"
+
+::
+
+  $ devlink dev flash pci/0000:$bdf file DEV_OTA.img component "mcf3"
+
+Note: Component selects the partition type to be programmed.
+
+
+The supported list of firmware image types is described below.
+
+.. list-table:: Firmware Image types
+    :widths: 15 85
+
+    * - Name
+      - Description
+    * - ``preloader``
+      - The first-stage bootloader image
+    * - ``loader_ext1``
+      - Preloader extension image
+    * - ``tee1``
+      - ARM trusted firmware and TEE (Trusted Execution Environment) image
+    * - ``lk``
+      - The second-stage bootloader image
+    * - ``spmfw``
+      - MediaTek in-house ASIC for power management image
+    * - ``sspm_1``
+      - MediaTek in-house ASIC for power management under secure world image
+    * - ``mcupm_1``
+      - MediaTek in-house ASIC for cpu power management image
+    * - ``dpm_1``
+      - MediaTek in-house ASIC for dram power management image
+    * - ``boot``
+      - The kernel and dtb image
+    * - ``rootfs``
+      - Root filesystem image
+    * - ``md1img``
+      - Modem image
+    * - ``md1dsp``
+      - Modem DSP image
+    * - ``mcf1``
+      - Modem OTA image (Modem Configuration Framework) for operators
+    * - ``mcf2``
+      - Modem OTA image (Modem Configuration Framework) for OEM vendors
+    * - ``mcf3``
+      - Modem OTA image (other usage) for OEM configurations
+
+
+Regions
+=======
+
+The ``t7xx`` driver supports core dump collection in exception state and second
+stage bootloader log collection in fastboot mode. The log snapshot is taken by
+the driver using fastboot commands.
+
+Region commands
+---------------
+
+::
+
+  $ devlink region show
+
+This command list the regions implemented by driver. These regions are accessed
+for device internal data. Below table describes the regions.
+
+.. list-table:: Regions
+    :widths: 15 85
+
+    * - Name
+      - Description
+    * - ``mr_dump``
+      - The detailed modem component logs are captured in this region
+    * - ``lk_dump``
+      - This region dumps the current snapshot of lk
+
+Coredump Collection
+~~~~~~~~~~~~~~~~~~~
+
+::
+
+  $ devlink region new mr_dump
+
+::
+
+  $ devlink region read mr_dump snapshot 0 address 0 length $len
+
+::
+
+  $ devlink region del mr_dump snapshot 0
+
+Note: $len is actual len to be dumped.
+
+The userspace application uses these commands for obtaining the modem component
+logs when device encounters an exception.
+
+Second Stage Bootloader dump
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+  $ devlink region new lk_dump
+
+::
+
+  $ devlink region read lk_dump snapshot 0 address 0 length $len
+
+::
+
+  $ devlink region del lk_dump snapshot 0
+
+Note: $len is actual len to be dumped.
+
+In fastboot mode the userspace application uses these commands for obtaining the
+current snapshot of second stage bootloader.
-- 
2.34.1

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