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From: "Michael Büsch" <mb@bu3sch.de>
To: "Rafał Miłecki" <zajec5@gmail.com>
Cc: George Kashperko <george@znau.edu.ua>, linux-wireless@vger.kernel.org
Subject: Re: SSB AI support code
Date: Thu, 10 Feb 2011 00:10:08 +0100	[thread overview]
Message-ID: <1297293008.9734.45.camel@maggie> (raw)
In-Reply-To: <AANLkTimS7Q5Du5_r3dZbF1gfpDofjL3Vm-AdEZP=zDQd@mail.gmail.com> (sfid-20110209_235402_132054_FFFFFFFFCF302BC4)

On Wed, 2011-02-09 at 23:53 +0100, Rafał Miłecki wrote: 
> OK, I think I'll need some your help with better understanding SSB.
> 
> AFAIK SSB is "box" (ssb_bus) containing cores (ssb_devices).

SSB and AI are just simple interconnects that can be used on-chip
or on embedded boards. The devices connected to this interconnect
(or bus) are the "cores".

> How do we talk with SSB? Is this that magic "Hostbus"? What does it
> mean? Do we use one of the cores of ssb_bus to talk? Is this why I see
> "ssb: Core 2 found: PCI-E (cc 0x820, rev 0x02, vendor 0x4243)"? If
> only one core can be selected at time, how is this possible we selecre
> 802.11 core and we are still able to talk with SSB?

That completely depends on what hostbus we're on. It's completely hidden
by SSB's I/O ops. For the trivial case without any hostbus (embedded),
the cores
are simply mapped into MMIO one after another. For the PCI hostbus case,
the MMIO has to be remapped (through PCI config space) on each
core switch. (Core switches are completely hidden from the device 
drivers). PCMCIA and SDIO are similar.

> What are the other cores for? Why do we need driver for chipcommon,
> mipscore? Are that cores internally accessed by 80211 core?

The chipcommon is a management core for the interconnect.

Device drivers are (mostly) distinct. There are a few exceptions.
Built-in device drivers (drivers/ssb/driver_....c) have some
interdependencies. However, b43, b44 and ssb-gige are completely
independent, for example.

> What is that whole AI? Is that replacement for SSB? Does it also
> contains cores? What AI and SSB share?

It is a replacement that shares some register API and design
decisions with SSB.
People who worked some time with broadcom stuff will recognize the
pattern: Take old stuff -> redesign it -> put lots of workarounds
and patching layers on top of it to be theoretically compatible
with old code -> fail at being fully compatible -> release it.

-- 
Greetings Michael.


  reply	other threads:[~2011-02-09 23:10 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-09 13:36 SSB AI support code George Kashperko
2011-02-09 14:29 ` SSB AI support code ([RFC1/11] SSB admatch redefine) George Kashperko
2011-02-09 14:31 ` SSB AI support code ([RFC2/11] SSB reintroduce handlers as device ops) George Kashperko
2011-02-09 14:32 ` SSB AI support code ([RFC3/11] SSB irqflag device op) George Kashperko
2011-02-09 16:19   ` Larry Finger
2011-02-09 17:10     ` George Kashperko
2011-02-09 17:48       ` Larry Finger
2011-02-09 18:23         ` George Kashperko
2011-02-09 19:19           ` Larry Finger
2011-02-09 19:26             ` George Kashperko
2011-02-09 19:42               ` Larry Finger
2011-02-09 14:34 ` SSB AI support code ([RFC4/11] SSB core control and state device ops) George Kashperko
2011-02-09 20:35   ` Rafał Miłecki
2011-02-09 21:01     ` Rafał Miłecki
2011-02-09 21:21       ` George Kashperko
2011-02-09 21:03     ` George Kashperko
2011-02-09 21:14       ` Michael Büsch
2011-02-09 21:55       ` Rafał Miłecki
2011-02-09 21:58         ` George Kashperko
2011-02-09 22:00         ` George Kashperko
2011-02-09 22:02         ` Michael Büsch
2011-02-09 22:22           ` George Kashperko
2011-02-09 14:36 ` SSB AI support code ([RFC5/11] SSB propagate core control and state ops usage) George Kashperko
2011-02-09 20:58   ` Rafał Miłecki
2011-02-09 21:12     ` Michael Büsch
2011-02-09 21:26     ` George Kashperko
2011-02-09 21:50       ` Rafał Miłecki
2011-02-09 21:55         ` George Kashperko
2011-02-09 14:37 ` SSB AI support code ([RFC6/11] SSB introduce bus_check_core routine) George Kashperko
2011-02-09 14:39 ` SSB AI support code ([RFC7/11] SSB introduce ssb_bus_detect routine) George Kashperko
2011-02-09 14:40 ` SSB AI support code ([RFC8/11] SSB separate SB-specific scanning) George Kashperko
2011-02-09 14:41 ` SSB AI support code ([RFC9/11] SSB modify irqflag treatment) George Kashperko
2011-02-09 16:23   ` Larry Finger
2011-02-09 16:53     ` George Kashperko
2011-02-09 14:44 ` SSB AI support code ([RFC9/11] SSB separate SB-specific code) George Kashperko
2011-02-09 14:45 ` SSB AI support code ([RFC10/11] SSB modify irqflag treatment) George Kashperko
2011-02-09 14:46 ` SSB AI support code ([RFC11/11] SSB add AI-bus support) George Kashperko
2011-02-09 16:25   ` Larry Finger
2011-02-09 18:33     ` George Kashperko
2011-02-09 16:49   ` Larry Finger
2011-02-09 21:35 ` SSB AI support code Rafał Miłecki
2011-02-09 21:41   ` George Kashperko
2011-02-09 21:51   ` Michael Büsch
2011-02-09 22:53     ` Rafał Miłecki
2011-02-09 23:10       ` Michael Büsch [this message]
2011-02-09 23:18       ` Larry Finger
2011-02-10  5:24         ` SSB AI support code ([RFC] v2) George Kashperko
2011-02-10 10:20           ` Michael Büsch
2011-02-10 17:40             ` George Kashperko
2011-02-10 18:11               ` Michael Büsch
     [not found]                 ` <1297362251.15805.51.camel@dev.znau.edu.ua>
     [not found]                   ` <1297363781.30218.37.camel@maggie>
2011-02-10 19:52                     ` George Kashperko
2011-02-10 20:07                       ` Michael Büsch
2011-02-15 14:50                 ` Rafał Miłecki
2011-02-15 15:05                   ` George Kashperko
2011-02-09 23:30       ` SSB AI support code George Kashperko
2011-02-15 14:48         ` Rafał Miłecki
2011-02-15 14:53           ` George Kashperko
2011-02-12 13:03 ` Hauke Mehrtens
2011-02-12 14:15   ` George Kashperko
2011-02-17  9:28   ` Roland Vossen

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