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

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Message-ID: <8178cbaa-0f36-5553-dfa0-3286ae10ddce@linux.intel.com>
Date:   Fri, 21 Apr 2017 16:14:31 -0500
From:   "Li, Yi" <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


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?

>> ...
>>
>> 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
...