From: baruch@tkos.co.il (Baruch Siach)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 1/3] ARM: Introduce atomic MMIO modify
Date: Fri, 23 Aug 2013 13:38:02 +0300 [thread overview]
Message-ID: <20130823103802.GO4600@tarshish> (raw)
In-Reply-To: <1377253445-2842-2-git-send-email-ezequiel.garcia@free-electrons.com>
HI Ezequiel,
On Fri, Aug 23, 2013 at 07:24:03AM -0300, Ezequiel Garcia wrote:
> Some SoC have MMIO regions that are shared across orthogonal
> subsystems. This commit implements a possible solution for the
> thread-safe access of such regions through a spinlock-protected API.
>
> Concurrent access is protected with a single spinlock for the
> entire MMIO address space. While this protects shared-registers,
> it also serializes access to unrelated/unshared registers.
>
> We add relaxed and non-relaxed variants, by using writel_relaxed and writel,
> respectively. The rationale for this is that some users may not require
> register write completion but only thread-safe access to a register.
>
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Is there a reason why this should be limited to ARM? I haven't found anything
ARM specific in the code.
baruch
--
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next prev parent reply other threads:[~2013-08-23 10:38 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-23 10:24 [PATCH v3 0/3] Introduce atomic MMIO register modify Ezequiel Garcia
2013-08-23 10:24 ` [PATCH v3 1/3] ARM: Introduce atomic MMIO modify Ezequiel Garcia
2013-08-23 10:38 ` Baruch Siach [this message]
2013-08-23 11:07 ` Ezequiel Garcia
2013-08-23 11:32 ` Ezequiel Garcia
2013-08-23 11:48 ` Catalin Marinas
2013-08-30 9:08 ` Will Deacon
2013-08-30 9:15 ` Catalin Marinas
2013-08-30 9:20 ` Will Deacon
2013-08-30 10:03 ` Catalin Marinas
2013-08-30 20:08 ` Jason Gunthorpe
2013-08-30 22:18 ` Russell King - ARM Linux
2013-09-05 8:59 ` Gregory CLEMENT
2013-09-05 9:08 ` Will Deacon
2013-09-05 9:20 ` Gregory CLEMENT
2013-09-06 16:48 ` Jason Gunthorpe
2013-08-23 11:28 ` Ezequiel Garcia
2013-08-23 10:24 ` [PATCH v3 2/3] clocksource: orion: Use atomic access for shared registers Ezequiel Garcia
2013-08-23 10:38 ` Baruch Siach
2013-08-23 10:49 ` Ezequiel Garcia
2013-08-23 10:24 ` [PATCH v3 3/3] watchdog: " Ezequiel Garcia
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