linux-kernel - Re: [PATCH][WAS:bcmai,axi] bcma: add Broadcom specific AMBA bus driver

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Date:	Sat, 7 May 2011 15:34:20 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-wireless@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	b43-dev@...ts.infradead.org, Greg KH <greg@...ah.com>,
	Michael Büsch <mb@...sch.de>,
	Larry Finger <Larry.Finger@...inger.net>,
	George Kashperko <george@...u.edu.ua>,
	Arend van Spriel <arend@...adcom.com>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <rmk@....linux.org.uk>,
	Andy Botting <andy@...ybotting.com>,
	linuxdriverproject <devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][WAS:bcmai,axi] bcma: add Broadcom specific AMBA bus driver

2011/5/6 Rafał Miłecki <zajec5@...il.com>:
> 2011/5/6 Arnd Bergmann <arnd@...db.de>:
>>> +const char *bcma_device_name(u16 coreid)
>>> +{
>>> +     switch (coreid) {
>>> +     case BCMA_CORE_OOB_ROUTER:
>>> +             return "OOB Router";
>>> +     case BCMA_CORE_INVALID:
>>> +             return "Invalid";
>>> +     case BCMA_CORE_CHIPCOMMON:
>>> +             return "ChipCommon";
>>> +     case BCMA_CORE_ILINE20:
>>> +             return "ILine 20";
>>
>> It's better to make that a data structure than a switch() statement,
>> both from readability and efficiency aspects.
>
> Well, maybe. We call it only once, at init time. In any case we're
> still waiting for Broadcom to clarify which cores are really used for
> BCMA.

Arnd: did you have a look at defines at all?

Most of the defines have values in range 0x800 → 0x837. Converting
this to array means loosing 0x800 u16 entries. We can not use 0x800
offset, because there are also some defined between 0x000 and 0x800:
#define BCMA_CORE_OOB_ROUTER           0x367   /* Out of band */
#define BCMA_CORE_INVALID              0x700

Oh and there is still:
#define BCMA_CORE_DEFAULT              0xFFF
we could want to include. Then we would loose additional (0xFFF -
0x837) u16 entries in array.

I'll just leave this huge "case". As I said, it's called only once on
initialization time. For standard PCI cards there are usually 3-5
cores, for embedded systems this number can be bigger, but still is
limited with 16 for 1 bus:
#define BCMA_MAX_NR_CORES              16

-- 
Rafał
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