From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wi0-x231.google.com ([2a00:1450:400c:c05::231]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VsHOm-0001bi-WB for barebox@lists.infradead.org; Sun, 15 Dec 2013 19:30:45 +0000 Received: by mail-wi0-f177.google.com with SMTP id cc10so1271165wib.16 for ; Sun, 15 Dec 2013 11:30:22 -0800 (PST) Date: Sun, 15 Dec 2013 20:30:16 +0100 From: Alexander Aring Message-ID: <20131215193015.GA539@omega> References: <1387119725-6803-1-git-send-email-antonynpavlov@gmail.com> <1387119725-6803-2-git-send-email-antonynpavlov@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1387119725-6803-2-git-send-email-antonynpavlov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [JUST RFC] ARM: DIGIC: add csrc-dummy To: Antony Pavlov Cc: barebox@lists.infradead.org Hi Antony, On Sun, Dec 15, 2013 at 07:02:05PM +0400, Antony Pavlov wrote: > The clocksource csrc-timer driver that uses DIGIC > hardware TIMER2 perfectrly works on Canon A1100, > but does not works on Canon EOS 600D. > IMHO we need additional timer initialisation. > > This patch introduces a quick-and-dirty termporary > solution for this situation: a clocksource driver that > does not use any hardware at all. > > Also this driver is very handy for running barebox > on Magic Lantern EOS qemu-based emulator as > the emulator does not realize timer counter register at all! > > Signed-off-by: Antony Pavlov > --- > arch/arm/mach-digic/Kconfig | 3 +++ > arch/arm/mach-digic/Makefile | 1 + > arch/arm/mach-digic/csrc-dummy.c | 49 ++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 53 insertions(+) > create mode 100644 arch/arm/mach-digic/csrc-dummy.c > > diff --git a/arch/arm/mach-digic/Kconfig b/arch/arm/mach-digic/Kconfig > index 557cad4..d0524bc 100644 > --- a/arch/arm/mach-digic/Kconfig > +++ b/arch/arm/mach-digic/Kconfig > @@ -16,4 +16,7 @@ config ARCH_TEXT_BASE > config DIGIC_CSRC_TIMER > bool > > +config DIGIC_CSRC_DUMMY > + bool > + > endif > diff --git a/arch/arm/mach-digic/Makefile b/arch/arm/mach-digic/Makefile > index 1d7cb72..31e5ac1 100644 > --- a/arch/arm/mach-digic/Makefile > +++ b/arch/arm/mach-digic/Makefile > @@ -1,2 +1,3 @@ > obj-y += core.o > obj-$(CONFIG_DIGIC_CSRC_TIMER) += csrc-timer.o > +obj-$(CONFIG_DIGIC_CSRC_DUMMY) += csrc-dummy.o > diff --git a/arch/arm/mach-digic/csrc-dummy.c b/arch/arm/mach-digic/csrc-dummy.c > new file mode 100644 > index 0000000..68c68a3 > --- /dev/null > +++ b/arch/arm/mach-digic/csrc-dummy.c > @@ -0,0 +1,49 @@ > +/* > + * Copyright (C) 2013 Antony Pavlov > + * > + * This file is part of barebox. > + * See file CREDITS for list of people who contributed to this project. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 > + * as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#include > +#include > + > +#include > + > +static uint64_t dummy_counter; > + > +static uint64_t dummy_cs_read(void) > +{ > + dummy_counter += 2000; > + return dummy_counter; > +} > + So if I understand it right, you assume here that the instructions to read this value will take 0.02 ms? - Alex _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox