linux-kernel - RE: [PATCH] driver: char: bfin_crc: CRC hardware accelerator driver for BF60x family processors.

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Date:	Thu, 17 May 2012 06:55:36 -0400
From:	"Zhang, Sonic" <Sonic.Zhang@...log.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Arnd Bergmann <arnd@...db.de>, LKML <linux-kernel@...r.kernel.org>,
	"uclinux-dist-devel@...ckfin.uclinux.org" 
	<uclinux-dist-devel@...ckfin.uclinux.org>
Subject: RE: [PATCH] driver: char: bfin_crc: CRC hardware accelerator driver
 for BF60x family processors.

Hi Greg,

>-----Original Message-----
>From: Greg Kroah-Hartman [mailto:gregkh@...uxfoundation.org]
>Sent: Wednesday, May 16, 2012 8:13 PM
>To: Zhang, Sonic
>Cc: Arnd Bergmann; LKML; uclinux-dist-devel@...ckfin.uclinux.org
>Subject: Re: [PATCH] driver: char: bfin_crc: CRC hardware accelerator driver for
>BF60x family processors.
>
>On Wed, May 16, 2012 at 04:26:07PM +0800, sonic.zhang@...log.com wrote:
>> From: Sonic Zhang <sonic.zhang@...log.com>
>>
>> The CRC peripheral is a hardware block used to compute the CRC of the block
>> of data. This is based on a CRC32 engine which computes the CRC value of 32b
>> data words presented to it. For data words of < 32b in size, it is the
>> responsibility of the application to pack the data into 32b data units.
>>
>> This driver defines data strcture crc_info and 4 IOCTL interfaces for applciations.
>> 1) CRC Memory Scan
>> 2) CRC Memory Transfer
>> 3) CRC Data Verify
>> 4) CRC Data Fill
>>
>> Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
>> ---
>>  drivers/char/Kconfig    |    8 +
>>  drivers/char/Makefile   |    1 +
>>  drivers/char/bfin_crc.c |  537
>+++++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 546 insertions(+), 0 deletions(-)
>>  create mode 100644 drivers/char/bfin_crc.c
>
>Why is this a char driver, and not a crypto driver, using the existing
>crypto userspace api for things like this?
>

It looks only the CRC memory scan mode can be implemented as a crypto ahash driver. The other 3 functions are not supported in the crypto framework.
I will post a crypto driver for the CRC memory scan mode later.

Sonic


>> diff --git a/drivers/char/bfin_crc.c b/drivers/char/bfin_crc.c
>> new file mode 100644
>> index 0000000..3f7d1d8
>> --- /dev/null
>> +++ b/drivers/char/bfin_crc.c
>> @@ -0,0 +1,537 @@
>> +/*
>> + * Blackfin On-Chip hardware CRC Driver
>> + *
>> + * Copyright 2011 Analog Devices Inc.
>> + *
>> + * Licensed under the GPL-2 or later.
>
>Do you really mean "or later"?  It's fine if you do, just checking.
>
>thanks,
>
>greg k-h


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