On Tue, 24 Feb 2009, Brad Boyer wrote:
On Tue, Feb 24, 2009 at 07:37:08PM +0100, Alessandro Zummo wrote:
On Tue, 24 Feb 2009 18:56:03 +0100 (CET)
Geert Uytterhoeven <Geert.Uytterhoeven@xxxxxxxxxxx> wrote:
Converting all (ca. 20?) ppc and m68k RTC support code into individual RTC
class drivers would add ca. 100+ lines of code for each individual driver.
How different are all of those boards? It's simply a matter
of parameters and offsets? can we group them somehow?
I imagine we could cut down the numbers somewhat with clever code sharing,
but it's still going to be a fairly large number. I don't know all the
embedded boards, but just with all the Macintosh models there are at
least three and maybe four drastically different methods of RTC access,
and all of them are directly tied to some chip that does something else
completely unrelated. For one of them we don't even have a driver at the
Yeah, on Mac/m68k the RTC is usually handled by a chip that does lots of other
things, so you need to keep the bulk of the code in arch/m68k/ anyway.
moment. They also are all custom chips that wouldn't be used anywhere
else. The other thing we need to keep in mind is that if we do it right
we can share drivers across m68k and powerpc in some cases. I imagine
some of the embedded powerpc boards are using chips that are common in
other architectures as well.
Many embedded powerpc boards already have RTC class drivers under drivers/rtc/,
as their RTC chips are sufficiently common.
The ones that don't are mostly "workstation" or "server" type hardware. The
full list is:
- rtas_set_rtc_time
- mpc8xx_set_rtc_time
- beat_get_rtc_time
- chrp_set_rtc_time
- iSeries_set_rtc_time
- maple_set_rtc_time
- pmac_set_rtc_time
- ps3_set_rtc_time
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: Geert.Uytterhoeven@xxxxxxxxxxx
Internet: http://www.sony-europe.com/
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