From: Wolfgang Grandegger <wg@grandegger•com>
To: David Miller <davem@davemloft•net>
Cc: agust@denx•de, netdev@vger•kernel.org, dzu@denx•de, wd@denx•de,
jcrigby@gmail•com, kosmo@semihalf•com, linuxppc-dev@ozlabs•org,
grant.likely@secretlab•ca
Subject: Re: [net-next-2.6 PATCH 2/3] fs_enet: Add support for MPC512x to fs_enet driver
Date: Wed, 10 Feb 2010 10:15:54 +0100 [thread overview]
Message-ID: <4B72794A.9010805@grandegger.com> (raw)
In-Reply-To: <20100209.121356.216640014.davem@davemloft.net>
Hi David,
David Miller wrote:
> From: Anatolij Gustschin <agust@denx•de>
> Date: Tue, 9 Feb 2010 15:23:17 +0100
>
>> In my understanding, in the ESP scsi driver the set of defines for
>> the register offsets is common for all chip drivers. The chip driver
>> methods for register access translate the offsets because the
>> registers on some chips are at different intervals (4-byte, 1-byte,
>> 16-byte for mac_esp.c). But the register order is the same for
>> different chips.
>>
>> In our case non only the register order is not the same for 8xx
>> FEC and 5121 FEC, but there are also other differences, different
>> reserved areas between several registers, some registers are
>> available only on 8xx and some only on 5121.
>
> That only means you would need to use a table based register address
> translation scheme, rather than a simple calculation. Something
> like:
>
> static unsigned int chip_xxx_table[] =
> {
> [GENERIC_REG_FOO] = CHIP_XXX_FOO,
> ...
> };
>
> static u32 chip_xxx_read_reg(struct chip *p, unsigned int reg)
> {
> unsigned int reg_off = chip_xxx_table[reg];
>
> return readl(p->regs + reg_off);
> }
>
> And this table can have special tokens in entries for
> registers which do not exist on a chip, so you can trap
> attempted access to them in these read/write handlers.
Yes, that could be done, but to honest, I do not see any improvement in
respect to the previous patch where the register offset were defined via
pointers within a structure.
> Please stop looking for excuses to fork this driver, a
> unified driver I think can be done cleanly.
Other people suggested to fork the driver because it's getting too ugly.
Wolfgang.
next prev parent reply other threads:[~2010-02-10 9:17 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 2:13 [net-next-2.6 PATCH 0/3] Support for MPC512x FEC Anatolij Gustschin
2010-01-21 2:13 ` [net-next-2.6 PATCH 1/3] fs_enet: use dev_xxx instead of printk Anatolij Gustschin
2010-01-21 16:43 ` Grant Likely
2010-01-21 2:13 ` [net-next-2.6 PATCH 2/3] fs_enet: Add support for MPC512x to fs_enet driver Anatolij Gustschin
2010-01-21 9:22 ` David Miller
2010-01-21 9:33 ` Anatolij Gustschin
2010-01-21 15:25 ` Wolfgang Grandegger
2010-01-22 2:03 ` David Miller
2010-01-22 9:35 ` Wolfgang Grandegger
2010-02-09 14:23 ` Anatolij Gustschin
2010-02-09 20:13 ` David Miller
2010-02-10 9:15 ` Wolfgang Grandegger [this message]
2010-02-10 10:20 ` Wolfgang Grandegger
2010-02-10 14:28 ` Grant Likely
2010-01-23 9:23 ` Arnd Bergmann
2010-01-24 14:40 ` Wolfgang Grandegger
2010-01-24 16:41 ` Wolfgang Denk
2010-01-27 2:06 ` Arnd Bergmann
2010-01-27 8:13 ` Wolfgang Grandegger
2010-01-21 20:15 ` Wolfgang Grandegger
2010-01-21 2:13 ` [net-next-2.6 PATCH 3/3] fs_enet: Add FEC TX Alignment workaround for MPC5121 Anatolij Gustschin
2010-01-21 16:49 ` Grant Likely
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B72794A.9010805@grandegger.com \
--to=wg@grandegger$(echo .)com \
--cc=agust@denx$(echo .)de \
--cc=davem@davemloft$(echo .)net \
--cc=dzu@denx$(echo .)de \
--cc=grant.likely@secretlab$(echo .)ca \
--cc=jcrigby@gmail$(echo .)com \
--cc=kosmo@semihalf$(echo .)com \
--cc=linuxppc-dev@ozlabs$(echo .)org \
--cc=netdev@vger$(echo .)kernel.org \
--cc=wd@denx$(echo .)de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox