From 64302024bce5d52594b80e5e6188abc85ff7cb0e Mon Sep 17 00:00:00 2001 From: M Chetan Kumar Date: Sun, 19 Sep 2021 22:58:18 +0530 Subject: [PATCH] net: wwan: iosm: devlink fw flashing & cd collection documentation Documents devlink params, fw update & cd collection commands and its usage. Signed-off-by: M Chetan Kumar Signed-off-by: David S. Miller --- Documentation/networking/devlink/index.rst | 1 + Documentation/networking/devlink/iosm.rst | 182 +++++++++++++++++++++++++++++ 2 files changed, 183 insertions(+) create mode 100644 Documentation/networking/devlink/iosm.rst diff --git a/Documentation/networking/devlink/index.rst b/Documentation/networking/devlink/index.rst index 45b5f8b..19ffd56 100644 --- a/Documentation/networking/devlink/index.rst +++ b/Documentation/networking/devlink/index.rst @@ -47,3 +47,4 @@ parameters, info versions, and other features it supports. ti-cpsw-switch am65-nuss-cpsw-switch prestera + iosm diff --git a/Documentation/networking/devlink/iosm.rst b/Documentation/networking/devlink/iosm.rst new file mode 100644 index 0000000..dd460c1 --- /dev/null +++ b/Documentation/networking/devlink/iosm.rst @@ -0,0 +1,182 @@ +.. SPDX-License-Identifier: GPL-2.0 + +==================== +iosm devlink support +==================== + +This document describes the devlink features implemented by the ``iosm`` +device driver. + +Parameters +========== + +The ``iosm`` driver implements the following driver-specific parameters. + +.. list-table:: Driver-specific parameters implemented + :widths: 5 5 5 85 + + * - Name + - Type + - Mode + - Description + * - ``erase_full_flash`` + - u8 + - runtime + - erase_full_flash parameter is used to check if full erase is required for + the device during firmware flashing. + If set, Full nand erase command will be sent to the device. By default, + only conditional erase support is enabled. + * - ``download_region`` + - u8 + - runtime + - download_region parameter is used to identify if we are flashing the + loadmap/region file during the firmware flashing. + * - ``address`` + - u32 + - runtime + - address parameter is used to send the address information of the + loadmap/region file which is required during the firmware flashing + process. Each region file has be flashed to its respective flash address. + * - ``region_count`` + - u8 + - runtime + - region_count parameter is used to inform the driver on how many total + loadmap/region files are present in modem firmware image that has to be + flashed. + + +Flash Update +============ + +The ``iosm`` driver implements support for flash update using the +``devlink-flash`` interface. + +It supports updating the device flash using a combined flash image which contains +the Bootloader images and other modem software images. + +The driver uses DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT to identify type of +firmware image that need to be flashed as requested by user space application. +Supported firmware image types. + +.. list-table:: Firmware Image types + :widths: 15 85 + + * - Name + - Description + * - ``PSI RAM`` + - Primary Signed Image + * - ``EBL`` + - External Bootloader + * - ``FLS`` + - Modem Software Image + +PSI RAM and EBL are the RAM images which are injected to the device when the +device is in BOOT ROM stage. Once this is successful, the actual modem firmware +image is flashed to the device. The modem software image contains multiple files +each having one secure bin file and at least one Loadmap/Region file. For flashing +these files, appropriate commands are sent to the modem device along with the +data required for flashing. The data like region count and address of each region +has to be passed to the driver using the devlink param command. + +If the device has to be fully erased before firmware flashing, user application +need to set the erase_full_flash parameter using devlink param command. +By default, conditional erase feature is supported. + +Flash Commands: +=============== +1) When modem is in Boot ROM stage, user can use below command to inject PSI RAM +image using devlink flash command. + +$ devlink dev flash pci/0000:02:00.0 file component PSI + +2) If user want to do a full erase, below command need to be issued to set the +erase full flash param (To be set only if full erase required). + +$ devlink dev param set pci/0000:02:00.0 name erase_full_flash value true cmode runtime + +3) Inject EBL after the modem is in PSI stage. +$ devlink dev flash pci/0000:02:00.0 file component EBL + +4) Once EBL is injected successfully, then the actual firmware flashing takes +place. Below is the sequence of commands used for each of the firmware images. + +a) Flash secure bin file. +$ devlink dev flash pci/0000:02:00.0 file component FLS + +b) Flashing the Loadmap/Region file +$ devlink dev param set pci/0000:02:00.0 name region_count value 1 cmode runtime + +$ devlink dev param set pci/0000:02:00.0 name download_region value true cmode runtime + +$ devlink dev param set pci/0000:02:00.0 name address value cmode runtime + +$ devlink dev flash pci/0000:02:00.0 file component FLS + +Regions +======= + +The ``iosm`` driver supports dumping the coredump logs. + +In case a firmware encounters an exception, a snapshot will be taken by the +driver. Following regions are accessed for device internal data. + +.. list-table:: Regions implemented + :widths: 15 85 + + * - Name + - Description + * - ``report.json`` + - The summary of exception details logged as part of this region. + * - ``coredump.fcd`` + - This region contains the details related to the exception occurred in the + device (RAM dump). + * - ``cdd.log`` + - This region contains the logs related to the modem CDD driver. + * - ``eeprom.bin`` + - This region contains the eeprom logs. + * - ``bootcore_trace.bin`` + - This region contains the current instance of bootloader logs. + * - ``bootcore_prev_trace.bin`` + - This region contains the previous instance of bootloader logs. + + +Region commands +=============== + +$ devlink region show + +$ devlink region new pci/0000:02:00.0/report.json + +$ devlink region dump pci/0000:02:00.0/report.json snapshot 0 + +$ devlink region del pci/0000:02:00.0/report.json snapshot 0 + +$ devlink region new pci/0000:02:00.0/coredump.fcd + +$ devlink region dump pci/0000:02:00.0/coredump.fcd snapshot 1 + +$ devlink region del pci/0000:02:00.0/coredump.fcd snapshot 1 + +$ devlink region new pci/0000:02:00.0/cdd.log + +$ devlink region dump pci/0000:02:00.0/cdd.log snapshot 2 + +$ devlink region del pci/0000:02:00.0/cdd.log snapshot 2 + +$ devlink region new pci/0000:02:00.0/eeprom.bin + +$ devlink region dump pci/0000:02:00.0/eeprom.bin snapshot 3 + +$ devlink region del pci/0000:02:00.0/eeprom.bin snapshot 3 + +$ devlink region new pci/0000:02:00.0/bootcore_trace.bin + +$ devlink region dump pci/0000:02:00.0/bootcore_trace.bin snapshot 4 + +$ devlink region del pci/0000:02:00.0/bootcore_trace.bin snapshot 4 + +$ devlink region new pci/0000:02:00.0/bootcore_prev_trace.bin + +$ devlink region dump pci/0000:02:00.0/bootcore_prev_trace.bin snapshot 5 + +$ devlink region del pci/0000:02:00.0/bootcore_prev_trace.bin snapshot 5 -- 2.7.4