linux-kernel - Re: [PATCH v3] fpga manager: Add Altera CvP driver

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Date:   Tue, 25 Apr 2017 11:49:23 -0500
From:   Yi Li <yi1.li@...ux.intel.com>
To:     matthew.gerlach@...ux.intel.com, Anatolij Gustschin <agust@...x.de>
Cc:     linux-fpga@...r.kernel.org,
        Alan Tull <atull@...nsource.altera.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] fpga manager: Add Altera CvP driver

hi Anatolij


On 04/21/2017 04:14 PM, Li, Yi wrote:
>
> On 4/20/2017 12:29 PM, matthew.gerlach@...ux.intel.com wrote:
>>
>>
>> On Thu, 20 Apr 2017, Anatolij Gustschin wrote:
>>
>>> Add FPGA manager driver for loading Arria/Cyclone/Stratix
>>> FPGAs via CvP.
>>>
>>> Signed-off-by: Anatolij Gustschin <agust@...x.de>
>>> ---
>>
>> Hi Anatolij,
>>
>> Since you say the driver works with Arria-10, I thought I would give 
>> it a try with the Altera Arria10 PCIe DevKit I am using.  I successfully
>> compiled your patch as an out of tree module against a 3.10 kernel.  
>> The module successfully loaded and created instances for both boards 
>> in the host.
>> Now that I have the driver instances running, I'm not sure howto 
>> actually perform CvP.  Do you use a debugfs interface or something 
>> else?  Do you use the sof or an rbf file?
>>
>> Thanks,
>> Matthew Gerlach
>>
>>> Changes in v3:
>>>
>>>  - removed V-series from description (since the driver works
>>>    also with Arria-10). Also renamed functions, config option
>>>    and driver file name. Changed module description in Kconfig
> From the User guild 
> https://www.altera.com/documentation/dsu1441819344145.html#dsu1442261652730, 
> it says Configuration via Protocol (CvP) is a configuration scheme 
> supported inArria^® V,Cyclone^® V,Stratix^® V, andArria^® 10device 
> families. But I have seen different CvP registers bitmask defines 
> somewhere else, so I am not positive that there is only one CvP 
> protocol for all Altera FPGAs. Maybe we could put those Vs + Arria 10 
> as supported devices on the Kconfig file on the safe side?

Reviewed the rest of the driver and it looks good to me.

>
>>> ...
>>>
>>> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
>>> index 161ba9d..be48c2e 100644
>>> --- a/drivers/fpga/Kconfig
>>> +++ b/drivers/fpga/Kconfig
>>> @@ -26,6 +26,13 @@ config FPGA_MGR_ICE40_SPI
>>>     help
>>>       FPGA manager driver support for Lattice iCE40 FPGAs over SPI.
>>>
>>> +config FPGA_MGR_ALTERA_CVP
>>> +    tristate "Altera Arria/Cyclone/Stratix CvP FPGA Manager"
>>> +    depends on PCI
>>> +    help
>>> +      FPGA manager driver support for Altera FPGAs using the
>>> +      CvP interface over PCIe.
>>> +
>>> config FPGA_MGR_SOCFPGA
>>>     tristate "Altera SOCFPGA FPGA Manager"
>>>     depends on ARCH_SOCFPGA || COMPILE_TEST
>>> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
>>> index 2a4f021..2e5c8b6 100644
>>> --- a/drivers/fpga/Makefile
>>> +++ b/drivers/fpga/Makefile
>>> @@ -6,6 +6,7 @@
>>> obj-$(CONFIG_FPGA)            += fpga-mgr.o
> ...