linux-kernel - Re: [PATCH 0/4] [SCSI] ufshcd: UFS Host Controller Driver

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Date:	Sun, 5 Feb 2012 16:20:47 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Vinayak Holikatti <vinholikatti@...il.com>
Cc:	James.Bottomley@...senpartnership.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	linux-samsung-soc@...r.kernel.org, saugata.das@...aro.org,
	arnd@...db.de, venkat@...aro.org, girish.shivananjappa@...aro.org,
	vishak.g@...sung.com, k.rajesh@...sung.com, yejin.moon@...sung.com,
	Santosh Yaraganavi <santoshsy@...il.com>
Subject: Re: [PATCH 0/4] [SCSI] ufshcd: UFS Host Controller Driver

2012/2/2 Vinayak Holikatti <vinholikatti@...il.com>:
> From: Santosh Yaraganavi <santoshsy@...il.com>
>
> UFS is designed to be the most advanced specification for
> both embedded and removable flash memory-based storage in mobile devices
> such as smart phones and tablet computers.  The UFS standard represents
> an evolutionary progression of JEDEC standards in this field, and has been
> specifically tailored for mobile applications and computing systems requiring
> high performance and low power consumption.  The initial data throughput for
> UFS will be ~300 megabytes per second (MB/s), and the standard also supports
> command queuing features to raise random read/write speeds.
>
> To achieve the highest performance and most power efficient data
> transport, UFS uses the leading industry interface standards to form its
> Interconnect Layer: MIPI® Alliance’s M-PHY and UniProSM  specifications.
> UniPro is a comprehensive specification meant to act as a universal
> chip-to-chip protocol, providing a common tunnel for other protocols.
> The M-PHY interface is designed as the primary physical interface (PHY layer)
> for the UniPro specification, and is a high speed serial interface targeting
> up to 2.9 gigabits per second (Gbps) per lane with up-scalability to 5.8Gbps
> per lane.
>
> MIPI’s M-PHY and UniPro specifications are optimized for mobile applications,
> and are designed from the ground up for efficient power management in mobile
> devices, including enabling efficient transitions between the active and power
> save modes. Combined with a low active power level and a near-zero idle power
> level, UFS offers the promise for significant reductions in device power
> consumption.
>
> The UFS standard adopts the well-known SCSI Architecture Model and command
> protocols supporting multiple commands with command queuing features and
> enabling a multi-thread programming paradigm. This differs from conventional
> flash-based memory cards and embedded flash solutions which process one
> command at a time, limiting random read/write access performance.
> In addition, a forthcoming complementary UFS Host Controller Interface (HCI)
> specification will allow system designers greater flexibility by simplifying
> the involvement of the host processor in the operation of the flash storage
> subsystem. The UFS HCI specification and the adoption of SCSI will provide
> a well-known software programming model and enable wider market adoption.
>
> This patchset contains PCIe based UFS host controller driver which complies
> to UFSHCI 1.0 and 1.1. The driver is based on Linux SCSI framework.
> The driver is tested with UFS Host controller(FPGA) and UFS device(FPGA).
>
> This patch set is successfully applied on kernel version 3.3-rc2.
>
> Santosh Yaraganavi (4):
>  [SCSI] ufshcd: UFS Host controller driver
>  [SCSI] ufshcd: UFS UTP Transfer requests handling
>  [SCSI] ufshcd: UFSHCI error handling
>  [SCSI] ufshcd: SCSI error handling
>
>  drivers/scsi/Kconfig      |    1 +
>  drivers/scsi/Makefile     |    1 +
>  drivers/scsi/ufs/Kconfig  |   49 ++
>  drivers/scsi/ufs/Makefile |    2 +
>  drivers/scsi/ufs/ufs.h    |  203 +++++
>  drivers/scsi/ufs/ufshcd.c | 1954 +++++++++++++++++++++++++++++++++++++++++++++
>  drivers/scsi/ufs/ufshci.h |  360 +++++++++
>  7 files changed, 2570 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/scsi/ufs/Kconfig
>  create mode 100644 drivers/scsi/ufs/Makefile
>  create mode 100644 drivers/scsi/ufs/ufs.h
>  create mode 100644 drivers/scsi/ufs/ufshcd.c
>  create mode 100644 drivers/scsi/ufs/ufshci.h
>
> --
> 1.7.5.4
Hi.
I have been waiting for ufs contribution.
Unfortunately I don't have real target supported ufs(maybe only you
have it). I can not debug and run this code, So just review only code
with specification.
>
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