From 7cc5a5d3cd4cca0a3852d1500e8c50fe191bcc9d Mon Sep 17 00:00:00 2001 From: Thor Thayer Date: Wed, 10 Feb 2016 13:26:24 -0600 Subject: ARM: socfpga: Enable OCRAM ECC on startup 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 Acked-by: Dinh Nguyen 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 Cc: mark.rutland@arm.com Cc: m.chehab@samsung.com Cc: pawel.moll@arm.com Cc: robh+dt@kernel.org Cc: Russell King 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 --- arch/arm/mach-socfpga/Makefile | 1 + arch/arm/mach-socfpga/core.h | 1 + arch/arm/mach-socfpga/ocram.c | 49 +++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-socfpga/socfpga.c | 3 +++ 4 files changed, 54 insertions(+) create mode 100644 arch/arm/mach-socfpga/ocram.c diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile index e9ab7c9444ff..ed15db19e561 100644 --- a/arch/arm/mach-socfpga/Makefile +++ b/arch/arm/mach-socfpga/Makefile @@ -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 diff --git a/arch/arm/mach-socfpga/core.h b/arch/arm/mach-socfpga/core.h index eb55d66a0eac..575195be6687 100644 --- a/arch/arm/mach-socfpga/core.h +++ b/arch/arm/mach-socfpga/core.h @@ -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; diff --git a/arch/arm/mach-socfpga/ocram.c b/arch/arm/mach-socfpga/ocram.c new file mode 100644 index 000000000000..60ec643ac2be --- /dev/null +++ b/arch/arm/mach-socfpga/ocram.c @@ -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 . + */ +#include +#include +#include +#include +#include + +#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); +} diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c index dd1ff07b0472..7e0aad2ec3d1 100644 --- a/arch/arm/mach-socfpga/socfpga.c +++ b/arch/arm/mach-socfpga/socfpga.c @@ -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) -- cgit