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ARM: socfpga: Enable OCRAM ECC on startup

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Enable ECC for On-Chip RAM on machine startup. The ECC has to be enabled
before data is stored in memory otherwise the ECC will fail on reads.

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Acked-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: devicetree@vger.kernel.org
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@arm.linux.org.uk
Cc: linux-doc@vger.kernel.org
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: mark.rutland@arm.com
Cc: m.chehab@samsung.com
Cc: pawel.moll@arm.com
Cc: robh+dt@kernel.org
Cc: Russell King <linux@arm.linux.org.uk>
Cc: tthayer.linux@gmail.com
Cc: tthayer@opensource.altera.com
Link: http://lkml.kernel.org/r/1455132384-17108-4-git-send-email-tthayer@opensource.altera.com
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Thor Thayer 2016-02-10 13:26:24 -06:00 committed by Borislav Petkov
parent 4d1138380e
commit 7cc5a5d3cd
4 changed files with 54 additions and 0 deletions
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1
arch/arm/mach-socfpga/Makefile
View File

@ -6,3 +6,4 @@ obj-y := socfpga.o
obj-$(CONFIG_SMP) += headsmp.o platsmp.o
obj-$(CONFIG_SOCFPGA_SUSPEND) += pm.o self-refresh.o
obj-$(CONFIG_EDAC_ALTERA_L2C) += l2_cache.o
obj-$(CONFIG_EDAC_ALTERA_OCRAM) += ocram.o

1
arch/arm/mach-socfpga/core.h
View File

@ -37,6 +37,7 @@
extern void socfpga_init_clocks(void);
extern void socfpga_sysmgr_init(void);
void socfpga_init_l2_ecc(void);
void socfpga_init_ocram_ecc(void);
extern void __iomem *sys_manager_base_addr;
extern void __iomem *rst_manager_base_addr;

49
arch/arm/mach-socfpga/ocram.c Normal file
View File

@ -0,0 +1,49 @@
/*
* Copyright Altera Corporation (C) 2016. 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/genalloc.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#define ALTR_OCRAM_CLEAR_ECC 0x00000018
#define ALTR_OCRAM_ECC_EN 0x00000019
void socfpga_init_ocram_ecc(void)
{
struct device_node *np;
void __iomem *mapped_ocr_edac_addr;
/* Find the OCRAM EDAC device tree node */
np = of_find_compatible_node(NULL, NULL, "altr,socfpga-ocram-ecc");
if (!np) {
pr_err("Unable to find socfpga-ocram-ecc\n");
return;
}
mapped_ocr_edac_addr = of_iomap(np, 0);
of_node_put(np);
if (!mapped_ocr_edac_addr) {
pr_err("Unable to map OCRAM ecc regs.\n");
return;
}
/* Clear any pending OCRAM ECC interrupts, then enable ECC */
writel(ALTR_OCRAM_CLEAR_ECC, mapped_ocr_edac_addr);
writel(ALTR_OCRAM_ECC_EN, mapped_ocr_edac_addr);
iounmap(mapped_ocr_edac_addr);
}

3
arch/arm/mach-socfpga/socfpga.c
View File

@ -61,6 +61,9 @@ static void __init socfpga_init_irq(void)
socfpga_sysmgr_init();
if (IS_ENABLED(CONFIG_EDAC_ALTERA_L2C))
socfpga_init_l2_ecc();
if (IS_ENABLED(CONFIG_EDAC_ALTERA_OCRAM))
socfpga_init_ocram_ecc();
}
static void socfpga_cyclone5_restart(enum reboot_mode mode, const char *cmd)