LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Mark Rutland <mark.rutland@arm.com>
To: "tthayer@opensource.altera.com" <tthayer@opensource.altera.com>
Cc: "bp@alien8.de" <bp@alien8.de>,
	"dougthompson@xmission.com" <dougthompson@xmission.com>,
	"m.chehab@samsung.com" <m.chehab@samsung.com>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	Pawel Moll <Pawel.Moll@arm.com>,
	"ijc+devicetree@hellion.org.uk" <ijc+devicetree@hellion.org.uk>,
	"galak@codeaurora.org" <galak@codeaurora.org>,
	"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
	"dinguyen@opensource.altera.com" <dinguyen@opensource.altera.com>,
	"grant.likely@linaro.org" <grant.likely@linaro.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"tthayer.linux@gmail.com" <tthayer.linux@gmail.com>
Subject: Re: [PATCHv6 1/5] arm: socfpga: Enable L2 Cache ECC on startup.
Date: Fri, 6 Feb 2015 18:52:02 +0000	[thread overview]
Message-ID: <20150206185202.GD10324@leverpostej> (raw)
In-Reply-To: <1420772036-3112-2-git-send-email-tthayer@opensource.altera.com>

On Fri, Jan 09, 2015 at 02:53:52AM +0000, tthayer@opensource.altera.com wrote:
> From: Thor Thayer <tthayer@opensource.altera.com>
> 
> This patch enables the ECC for L2 cache on machine
> startup.  The ECC has to be enabled before data is
> is stored in memory otherwise the ECC will fail on
> reads.

I take it you mean before the L2 cache is enabled (and its memories are
used), rather than before main memory is in use?

> 
> Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
> ---
> v2: Split OCRAM initialization into separate patch.
> 
> v3/4: No change
> 
> v5: Remove l2cache.h, use io.h instead of clk-provider.h
>     Make copyright header inclusive. Remove MAINTAINERS entry.
> 
> v6: Remove pr_debug() & update year in header.
> ---
>  arch/arm/mach-socfpga/Makefile   |    1 +
>  arch/arm/mach-socfpga/core.h     |    2 ++
>  arch/arm/mach-socfpga/l2_cache.c |   39 ++++++++++++++++++++++++++++++++++++++
>  arch/arm/mach-socfpga/socfpga.c  |    4 +++-
>  4 files changed, 45 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/mach-socfpga/l2_cache.c
> 
> diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile
> index 6dd7a93..142609e 100644
> --- a/arch/arm/mach-socfpga/Makefile
> +++ b/arch/arm/mach-socfpga/Makefile
> @@ -4,3 +4,4 @@
>  
>  obj-y					:= socfpga.o
>  obj-$(CONFIG_SMP)	+= headsmp.o platsmp.o
> +obj-$(CONFIG_EDAC_ALTERA_L2C) += l2_cache.o
> diff --git a/arch/arm/mach-socfpga/core.h b/arch/arm/mach-socfpga/core.h
> index 483cb46..28c8a15 100644
> --- a/arch/arm/mach-socfpga/core.h
> +++ b/arch/arm/mach-socfpga/core.h
> @@ -47,4 +47,6 @@ extern unsigned long socfpga_cpu1start_addr;
>  
>  #define SOCFPGA_SCU_VIRT_BASE   0xfffec000
>  
> +void socfpga_init_l2_ecc(void);
> +
>  #endif
> diff --git a/arch/arm/mach-socfpga/l2_cache.c b/arch/arm/mach-socfpga/l2_cache.c
> new file mode 100644
> index 0000000..047759d
> --- /dev/null
> +++ b/arch/arm/mach-socfpga/l2_cache.c
> @@ -0,0 +1,39 @@
> +/*
> + * Copyright Altera Corporation (C) 2015. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope 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.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +#include <linux/io.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_address.h>
> +
> +void socfpga_init_l2_ecc(void)
> +{
> +	struct device_node *np;
> +	void __iomem  *mapped_l2_edac_addr;
> +
> +	np = of_find_compatible_node(NULL, NULL, "altr,l2-edac");
> +	if (!np) {
> +		pr_err("SOCFPGA: Unable to find altr,l2-edac in dtb\n");
> +		return;
> +	}
> +
> +	mapped_l2_edac_addr = of_iomap(np, 0);
> +	if (!mapped_l2_edac_addr) {
> +		pr_err("SOCFPGA: Unable to find L2 ECC mapping in dtb\n");
> +		return;
> +	}
> +
> +	/* Enable ECC */
> +	writel(0x01, mapped_l2_edac_addr);

Missing of_node_put(np)?

Surely you're leaking the mapping here? It's locally scoped and you
never unmap it.

Thanks,
Mark.

  reply	other threads:[~2015-02-06 18:52 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-09  2:53 [PATCHv6 0/5] Add Altera peripheral memories to EDAC framework tthayer
2015-01-09  2:53 ` [PATCHv6 1/5] arm: socfpga: Enable L2 Cache ECC on startup tthayer
2015-02-06 18:52   ` Mark Rutland [this message]
2015-01-09  2:53 ` [PATCHv6 2/5] arm: socfpga: Enable OCRAM " tthayer
2015-02-06 18:45   ` Mark Rutland
2015-02-06 22:05     ` Thor Thayer
2015-01-09  2:53 ` [PATCHv6 3/5] edac: altera: Remove SDRAM module compile tthayer
2015-01-09  2:53 ` [PATCHv6 4/5] edac: altera: Add Altera L2 Cache and OCRAM EDAC Support tthayer
2015-02-06 19:17   ` Mark Rutland
2015-02-06 22:09     ` Thor Thayer
2015-02-07 10:02   ` Russell King - ARM Linux
2015-01-09  2:53 ` [PATCHv6 5/5] arm: dts: Add Altera L2 Cache and OCRAM EDAC entries tthayer
2015-02-06 17:03   ` [RESEND PATCHv6 " Thor Thayer
2015-02-06 19:24   ` [PATCHv6 " Mark Rutland
2015-02-06 22:04     ` Thor Thayer
2015-01-29 20:53 ` [PATCHv6 0/5] Add Altera peripheral memories to EDAC framework Thor Thayer
2015-02-06 19:29   ` Mark Rutland

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20150206185202.GD10324@leverpostej \
    --to=mark.rutland@arm.com \
    --cc=Pawel.Moll@arm.com \
    --cc=bp@alien8.de \
    --cc=devicetree@vger.kernel.org \
    --cc=dinguyen@opensource.altera.com \
    --cc=dougthompson@xmission.com \
    --cc=galak@codeaurora.org \
    --cc=grant.likely@linaro.org \
    --cc=ijc+devicetree@hellion.org.uk \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-edac@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@arm.linux.org.uk \
    --cc=m.chehab@samsung.com \
    --cc=robh+dt@kernel.org \
    --cc=tthayer.linux@gmail.com \
    --cc=tthayer@opensource.altera.com \
    --subject='Re: [PATCHv6 1/5] arm: socfpga: Enable L2 Cache ECC on startup.' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).