linux-kernel - RE: [PATCH 0/8] Introduced new Cadence USBSSP DRD Driver.

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Date:   Wed, 30 Sep 2020 07:43:45 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Peter Chen <peter.chen@....com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "rogerq@...com" <rogerq@...com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>,
        Sanket Parmar <sparmar@...ence.com>,
        "nsekhar@...com" <nsekhar@...com>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "chunfeng.yun@...iatek.com" <chunfeng.yun@...iatek.com>,
        "yanaijie@...wei.com" <yanaijie@...wei.com>
Subject: RE: [PATCH 0/8] Introduced new Cadence USBSSP DRD Driver.

>On 20-09-28 14:27:33, Pawel Laszczak wrote:
>> This patch introduce new Cadence USBSS DRD driver to linux kernel.
>>
>> The Cadence USBSS DRD Controller is a highly configurable IP Core which
>> can be instantiated as Dual-Role Device (DRD), Peripheral Only and
>> Host Only (XHCI)configurations.
>>
>> The current driver has been validated with FPGA burned. We have support
>> for PCIe bus, which is used on FPGA prototyping.
>>
>> The host side of USBSS-DRD controller is compliance with XHCI
>> specification, so it works with standard XHCI Linux driver.
>>
>> The host side of USBSS DRD controller is compliant with XHCI.
>
>The device side?

Yes, it should be device side.
Thanks

>
>> The architecture for device side is almost the same as for host side,
>> and most of the XHCI specification can be used to understand how
>> this controller operates.
>>
>> This controller and driver support Full Speed, Hight Speed, Supper Speed
>> and Supper Speed Plus USB protocol.
>>
>> The prefix cdnsp used in driver has chosen by analogy to cdn3 driver.
>> The last letter of this acronym means PLUS. The formal name of controller
>> is USBSSP but it's to generic so I've decided to use CDNSP.
>>
>> The patch 1: adds support for DRD CDNSP.
>> The patch 2: separates common code that can be reusable by cdnsp driver.
>> The patch 3: moves reusable code to separate module.
>> The patch 4: changes prefixes in reusable code frome cdns3 to common cdns.
>> The patch 5: adopts gadget_dev pointer in cdns structure to make possible
>> 	     use it in both drivers.
>> The patches 6-8: add the main part of driver and has been intentionally
>>              split into 3 part. In my opinion such division should not
>>              affect understanding and reviewing the driver, and cause that
>>              main patch (7/8) is little smaller. Patch 6 introduces main
>>              header file for driver, 7 is the main part that implements all
>>              functionality of driver and 8 introduces tracepoints.
>>
>> ---
>>
>> Pawel Laszczak (7):
>>   usb: cdns3: Add support for DRD CDNSP
>>   usb: cdns3: Split core.c into cdns3-plat and core.c file
>>   usb: cdns3: Moves reusable code to separate module
>>   usb: cdns3: Refactoring names in reusable code
>>   usb: cdns3: Changed type of gadget_dev in cdns structure
>>   usb: cdnsp: Device side header file for CDNSP driver
>>   usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver
>>   usb: cdnsp: Add tracepoints for CDNSP driver
>>
>>  drivers/usb/Kconfig               |    1 +
>>  drivers/usb/Makefile              |    1 +
>>  drivers/usb/cdns3/Kconfig         |    8 +
>>  drivers/usb/cdns3/Makefile        |    8 +-
>>  drivers/usb/cdns3/cdns3-plat.c    |  209 +++
>>  drivers/usb/cdns3/core.c          |  336 ++--
>>  drivers/usb/cdns3/core.h          |   51 +-
>>  drivers/usb/cdns3/drd.c           |  219 ++-
>>  drivers/usb/cdns3/drd.h           |   93 +-
>>  drivers/usb/cdns3/gadget-export.h |   26 +-
>>  drivers/usb/cdns3/gadget.c        |   29 +-
>>  drivers/usb/cdns3/host-export.h   |   10 +-
>>  drivers/usb/cdns3/host.c          |   23 +-
>>  drivers/usb/cdnsp/Kconfig         |   40 +
>>  drivers/usb/cdnsp/Makefile        |   12 +
>>  drivers/usb/cdnsp/cdnsp-pci.c     |  247 +++
>>  drivers/usb/cdnsp/debug.h         |  583 +++++++
>>  drivers/usb/cdnsp/ep0.c           |  500 ++++++
>>  drivers/usb/cdnsp/gadget.c        | 2009 ++++++++++++++++++++++++
>>  drivers/usb/cdnsp/gadget.h        | 1598 +++++++++++++++++++
>>  drivers/usb/cdnsp/mem.c           | 1326 ++++++++++++++++
>>  drivers/usb/cdnsp/ring.c          | 2426 +++++++++++++++++++++++++++++
>>  drivers/usb/cdnsp/trace.c         |   12 +
>>  drivers/usb/cdnsp/trace.h         |  840 ++++++++++
>>  24 files changed, 10228 insertions(+), 379 deletions(-)
>>  create mode 100644 drivers/usb/cdns3/cdns3-plat.c
>>  create mode 100644 drivers/usb/cdnsp/Kconfig
>>  create mode 100644 drivers/usb/cdnsp/Makefile
>>  create mode 100644 drivers/usb/cdnsp/cdnsp-pci.c
>>  create mode 100644 drivers/usb/cdnsp/debug.h
>>  create mode 100644 drivers/usb/cdnsp/ep0.c
>>  create mode 100644 drivers/usb/cdnsp/gadget.c
>>  create mode 100644 drivers/usb/cdnsp/gadget.h
>>  create mode 100644 drivers/usb/cdnsp/mem.c
>>  create mode 100644 drivers/usb/cdnsp/ring.c
>>  create mode 100644 drivers/usb/cdnsp/trace.c
>>  create mode 100644 drivers/usb/cdnsp/trace.h
>>
>> --
>> 2.17.1
>>
>
>--
>
>Thanks,
>Peter Chen