From: Arnd Bergmann <arnd@arndb.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Russell King <rmk+lkml@arm.linux.org.uk>,
Michal Simek <monstr@monstr.eu>,
linux-arch@vger.kernel.org,
Remis Lima Baima <remis.developer@googlemail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 04/27] asm-generic: add legacy I/O header files
Date: Fri, 1 May 2009 15:29:04 +0200 [thread overview]
Message-ID: <200905011529.04774.arnd@arndb.de> (raw)
In-Reply-To: <20090501140904.69f44406@lxorguk.ukuu.org.uk>
On Friday 01 May 2009, Alan Cox wrote:
> Joining in late but its not at all highly PC specific. The same frequency
> is used for a whole pile of setups (Alpha etc). It's not well named but
> there are good sound reasons the PC chose 1193182 and while those reasons
> have long lapsed its a good frequency for other reasons nowdays.
>
> The clock isn't for the PIC either - its for the PIT (although its used
> to clock various other things).
>
> We actually have a define of PIT_TICK_RATE internal to the x86 port for
> those x86 cases that can use it.
How about this comment then:
/*
* CLOCK_TICK_RATE is traditionally the base frequency using the PC-style
* i8253 "PIT" timer. Architecture independent device drivers should not
* rely on this value.
* Any architecture that either has a real PC-style PIT, or does not have a
* fixed timer interval at all and just needs to provide some value here
* should just fall back to this default.
*/
Arnd <><
next prev parent reply other threads:[~2009-05-01 13:29 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-30 15:34 [PATCH 00/27] more non-ABI asm-generic headers Arnd Bergmann
2008-11-06 12:08 ` [PATCH 01/27] asm-generic: rename atomic.h to atomic-long.h Arnd Bergmann
2009-04-30 16:06 ` Ingo Molnar
2008-11-06 12:24 ` [PATCH 03/27] asm-generic: make pci.h usable directly Arnd Bergmann
2008-11-06 13:16 ` [PATCH 04/27] asm-generic: add legacy I/O header files Arnd Bergmann
[not found] ` <c1a198be0904302309w4154f97dqddd0b2df1924a821@mail.gmail.com>
2009-05-01 12:22 ` Arnd Bergmann
2009-05-01 12:25 ` Michal Simek
2009-05-01 12:37 ` Russell King
2009-05-01 12:53 ` Arnd Bergmann
2009-05-01 13:14 ` Alan Cox
2009-05-01 13:20 ` Arnd Bergmann
2009-05-01 13:20 ` Arnd Bergmann
2009-05-01 13:40 ` Alan Cox
2009-05-01 13:09 ` Alan Cox
2009-05-01 13:29 ` Arnd Bergmann [this message]
2009-05-01 13:44 ` Alan Cox
2009-05-01 13:56 ` Arnd Bergmann
2009-05-01 14:03 ` Alan Cox
2009-05-01 14:07 ` Arnd Bergmann
2009-05-01 12:36 ` Russell King
2008-11-06 13:38 ` [PATCH 05/27] asm-generic: add generic io.h Arnd Bergmann
2009-05-04 7:07 ` Geert Uytterhoeven
2009-05-04 10:48 ` Arnd Bergmann
2008-11-06 13:40 ` [PATCH 07/27] asm-generic: add minimal cache description Arnd Bergmann
[not found] ` <c1a198be0904302303h73c5168fi73f8dc24dc677965@mail.gmail.com>
2009-05-01 12:27 ` Arnd Bergmann
2009-05-01 12:52 ` Michal Simek
2008-11-06 15:10 ` [PATCH 09/27] asm-generic: add generic NOMMU versions of some headers Arnd Bergmann
2008-11-06 15:26 ` [PATCH 10/27] asm-generic: rename page.h to getorder.h Arnd Bergmann
2008-11-06 15:31 ` [PATCH 12/27] asm-generic: add a NOMMU uaccess.h Arnd Bergmann
2009-05-01 10:07 ` Michal Simek
2009-05-01 10:22 ` Russell King
[not found] ` <c1a198be0904302337x714621d8xc4685a634c5cf222@mail.gmail.com>
2009-05-01 12:36 ` Arnd Bergmann
2009-05-01 12:38 ` Michal Simek
2009-05-01 12:38 ` Michal Simek
2009-05-01 13:13 ` [PATCH V3] asm-generic: add a generic uaccess.h Arnd Bergmann
2009-05-01 13:47 ` Michal Simek
2009-05-01 14:06 ` Arnd Bergmann
2009-05-01 14:11 ` Michal Simek
2009-05-04 6:07 ` Michal Simek
2009-05-04 10:32 ` Arnd Bergmann
2009-05-04 7:24 ` [PATCH 12/27] asm-generic: add a NOMMU uaccess.h Geert Uytterhoeven
2008-11-07 20:43 ` [PATCH 14/27] asm-generic: make bitops.h usable Arnd Bergmann
2008-11-08 10:37 ` [PATCH 15/27] asm-generic: Add missing generic tlb_flush definition Arnd Bergmann
2009-03-31 13:30 ` [PATCH 17/27] add generic lib/checksum.c Arnd Bergmann
2009-04-30 22:35 ` Jan-Benedict Glaw
2009-04-30 22:35 ` Jan-Benedict Glaw
2009-05-01 9:14 ` Arnd Bergmann
2009-05-01 9:20 ` Russell King
2009-05-01 9:23 ` Michal Simek
2009-05-01 9:35 ` Arnd Bergmann
2009-05-01 9:37 ` Michal Simek
2009-04-01 12:35 ` [PATCH 19/27] microblaze: make syscall_table implementation generic Arnd Bergmann
2009-04-14 13:12 ` [PATCH 20/27] microblaze: use the generic lib/checksum.c Remis Lima Baima
2009-04-15 13:00 ` [PATCH 23/27] microblaze: convert all simple headers to use asm-generic Remis Lima Baima
2009-04-15 15:28 ` [PATCH 22/27] microblaze: don't include asm/mmu.h in hw_exception_handler Arnd Bergmann
2009-04-20 11:53 ` [PATCH 25/27] microblaze: use generic uaccess.h Remis Lima Baima
2009-04-27 11:04 ` [PATCH 06/27] asm-generic: clean up asm-generic/io.h Remis Lima Baima
2009-04-27 11:10 ` [PATCH 26/27] microblaze: make io.h use asm-generic/io.h Remis Lima Baima
2009-04-27 12:42 ` [PATCH 27/27] microblaze: use generic system.h Remis Lima Baima
2009-04-27 15:18 ` [PATCH 21/27] microblaze: use generic swab.h Arnd Bergmann
2009-04-27 15:34 ` [PATCH 16/27] asm-generic: introduce generic syscalls.h Arnd Bergmann
2009-04-27 15:38 ` [PATCH 24/27] microblaze: use generic dma-mapping.h Arnd Bergmann
2009-04-28 14:15 ` [PATCH 08/27] asm-generic: add generic versions of common headers Arnd Bergmann
2009-04-30 16:41 ` David Miller
2009-04-30 16:49 ` Arnd Bergmann
2009-04-30 16:51 ` David Miller
2009-04-30 17:07 ` Arnd Bergmann
2009-04-30 17:12 ` David Miller
2009-04-30 17:34 ` Arnd Bergmann
2009-04-30 17:39 ` David Miller
2009-04-30 18:01 ` Sam Ravnborg
2009-04-29 13:33 ` [PATCH 13/27] asm-generic: make uaccess.h usable by mmu archs Arnd Bergmann
2009-04-29 14:25 ` [PATCH 18/27] microblaze: use generic syscalls.h Arnd Bergmann
2009-04-29 14:51 ` [PATCH 02/27] asm-generic: add generic atomic.h Arnd Bergmann
2009-04-29 14:55 ` [PATCH 11/27] asm-generic: add generic page.h Arnd Bergmann
2009-05-04 7:11 ` Geert Uytterhoeven
2009-04-30 16:39 ` [PATCH 0/2] use generic headers in x86 Arnd Bergmann
2009-04-30 16:40 ` [PATCH 1/2] x86: two small fixes in termios.h Arnd Bergmann
2009-04-30 16:42 ` [PATCH 2/2] x86: adapt simple headers to use generic headers Arnd Bergmann
2009-05-03 11:17 ` [PATCH 00/27] more non-ABI asm-generic headers Geert Uytterhoeven
2009-05-04 14:32 ` Arnd Bergmann
2009-05-08 14:04 ` Geert Uytterhoeven
2009-05-14 11:59 ` Arnd Bergmann
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