Message-ID: <545D430A.100@opensource.altera.com>
Date: Fri, 7 Nov 2014 16:09:14 -0600
From: Thor Thayer <tthayer@opensource.altera.com>
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To: Dinh Nguyen <dinguyen@opensource.altera.com>, <bp@alien8.de>,
        <dougthompson@xmission.com>, <m.chehab@samsung.com>,
        <robh+dt@kernel.org>, <pawel.moll@arm.com>, <mark.rutland@arm.com>,
        <ijc+devicetree@hellion.org.uk>, <galak@codeaurora.org>,
        <linux@arm.linux.org.uk>, <grant.likely@linaro.org>
CC: <devicetree@vger.kernel.org>, <linux-doc@vger.kernel.org>,
        <linux-edac@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <tthayer.linux@gmail.com>
Subject: Re: [PATCHv4 1/5] arm: socfpga: Enable L2 Cache ECC on startup.
References: <1415379263-12391-1-git-send-email-tthayer@opensource.altera.com> <1415379263-12391-2-git-send-email-tthayer@opensource.altera.com> <545D27D2.1080305@opensource.altera.com>
In-Reply-To: <545D27D2.1080305@opensource.altera.com>
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Hi Dinh,

On 11/07/2014 02:13 PM, Dinh Nguyen wrote:
> Hi Thor,
>
> On 11/07/2014 10:54 AM, 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.
>>
>> Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
>> ---
>> v2: Split OCRAM initialization into separate patch.
>>
>> v3/4: No change
>> ---
>>   MAINTAINERS                      |    1 +
>>   arch/arm/mach-socfpga/Makefile   |    1 +
>>   arch/arm/mach-socfpga/l2_cache.c |   44 ++++++++++++++++++++++++++++++++++++++
>>   arch/arm/mach-socfpga/l2_cache.h |   28 ++++++++++++++++++++++++
>>   arch/arm/mach-socfpga/socfpga.c  |    5 ++++-
>>   5 files changed, 78 insertions(+), 1 deletion(-)
>>   create mode 100644 arch/arm/mach-socfpga/l2_cache.c
>>   create mode 100644 arch/arm/mach-socfpga/l2_cache.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index ee1bc5b..d0c7752 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -1407,6 +1407,7 @@ ARM/SOCFPGA EDAC SUPPORT
>>   M:	Thor Thayer <tthayer@opensource.altera.com>
>>   S:	Maintained
>>   F:	drivers/edac/altera_edac.
>> +F:	arch/arm/mach-socfpga/l2_cache.*
>>   
>>   ARM/STI ARCHITECTURE
>>   M:	Srinivas Kandagatla <srinivas.kandagatla@gmail.com>
>> 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/l2_cache.c b/arch/arm/mach-socfpga/l2_cache.c
>> new file mode 100644
>> index 0000000..8e109f3
>> --- /dev/null
>> +++ b/arch/arm/mach-socfpga/l2_cache.c
>> @@ -0,0 +1,44 @@
>> +/*
>> + * Copyright Altera Corporation (C) 2014. 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/clk-provider.h>
> Why clk-provider.h and not io.h?
>> +#include <linux/of_platform.h>
>> +#include <linux/of_address.h>
>> +
>> +#include "l2_cache.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);
>> +
>> +	pr_debug("SOCFPGA: Success Initializing L2 cache ECC\n");
>> +}
>> +
> Extra line here...
>
>> diff --git a/arch/arm/mach-socfpga/l2_cache.h b/arch/arm/mach-socfpga/l2_cache.h
>> new file mode 100644
>> index 0000000..58e140d
>> --- /dev/null
>> +++ b/arch/arm/mach-socfpga/l2_cache.h
>> @@ -0,0 +1,28 @@
>> +/*
>> + * Copyright Altera Corporation (C) 2014. 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/>.
>> + */
>> +
>> +#ifndef MACH_SOCFPGA_L2_CACHE_H
>> +#define MACH_SOCFPGA_L2_CACHE_H
>> +
>> +#ifdef CONFIG_EDAC_ALTERA_L2C
>> +void socfpga_init_l2_ecc(void);
>> +#else
>> +inline void socfpga_init_l2_ecc(void)
>> +{
>> +}
>> +#endif
>> +
>> +#endif /* #ifndef MACH_SOCFPGA_L2_CACHE_H */
>> diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
>> index adbf383..af6413a 100644
>> --- a/arch/arm/mach-socfpga/socfpga.c
>> +++ b/arch/arm/mach-socfpga/socfpga.c
>> @@ -1,5 +1,5 @@
>>   /*
>> - *  Copyright (C) 2012 Altera Corporation
>> + *  Copyright (C) 2012;2014 Altera Corporation
> Should be "2012-2014".
>
>>    *
>>    * This program is free software; you can redistribute it and/or modify
>>    * it under the terms of the GNU General Public License as published by
>> @@ -25,6 +25,8 @@
>>   #include <asm/mach/map.h>
>>   
>>   #include "core.h"
>> +#include "l2_cache.h"
>> +#include "ocram.h"
> Including ocram.h should go into patch 2/5. But I think ocram.h can be
> removed as well if you just use IS_ENABLED().
>
>>   
>>   void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE));
>>   void __iomem *sys_manager_base_addr;
>> @@ -83,6 +85,7 @@ static void __init socfpga_init_irq(void)
>>   {
>>   	irqchip_init();
>>   	socfpga_sysmgr_init();
>> +	socfpga_init_l2_ecc();
> If you use "if (IS_ENABLED(CONFIG_EDAC_ALTERA_L2C))", then you can
> remove l2_cache.h.
>
> Dinh
>
>
Yes, this is cleaner. I will make these changes. Thanks!
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