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 <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>
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@ -6,3 +6,4 @@ obj-y := socfpga.o
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obj-$(CONFIG_SMP) += headsmp.o platsmp.o
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obj-$(CONFIG_SOCFPGA_SUSPEND) += pm.o self-refresh.o
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obj-$(CONFIG_EDAC_ALTERA_L2C) += l2_cache.o
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obj-$(CONFIG_EDAC_ALTERA_OCRAM) += ocram.o
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@ -37,6 +37,7 @@
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extern void socfpga_init_clocks(void);
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extern void socfpga_sysmgr_init(void);
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void socfpga_init_l2_ecc(void);
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void socfpga_init_ocram_ecc(void);
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extern void __iomem *sys_manager_base_addr;
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extern void __iomem *rst_manager_base_addr;
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49
arch/arm/mach-socfpga/ocram.c
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49
arch/arm/mach-socfpga/ocram.c
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@ -0,0 +1,49 @@
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/*
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* Copyright Altera Corporation (C) 2016. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/io.h>
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#include <linux/genalloc.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#define ALTR_OCRAM_CLEAR_ECC 0x00000018
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#define ALTR_OCRAM_ECC_EN 0x00000019
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void socfpga_init_ocram_ecc(void)
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{
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struct device_node *np;
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void __iomem *mapped_ocr_edac_addr;
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/* Find the OCRAM EDAC device tree node */
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np = of_find_compatible_node(NULL, NULL, "altr,socfpga-ocram-ecc");
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if (!np) {
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pr_err("Unable to find socfpga-ocram-ecc\n");
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return;
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}
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mapped_ocr_edac_addr = of_iomap(np, 0);
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of_node_put(np);
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if (!mapped_ocr_edac_addr) {
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pr_err("Unable to map OCRAM ecc regs.\n");
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return;
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}
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/* Clear any pending OCRAM ECC interrupts, then enable ECC */
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writel(ALTR_OCRAM_CLEAR_ECC, mapped_ocr_edac_addr);
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writel(ALTR_OCRAM_ECC_EN, mapped_ocr_edac_addr);
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iounmap(mapped_ocr_edac_addr);
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}
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@ -61,6 +61,9 @@ static void __init socfpga_init_irq(void)
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socfpga_sysmgr_init();
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if (IS_ENABLED(CONFIG_EDAC_ALTERA_L2C))
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socfpga_init_l2_ecc();
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if (IS_ENABLED(CONFIG_EDAC_ALTERA_OCRAM))
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socfpga_init_ocram_ecc();
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}
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static void socfpga_cyclone5_restart(enum reboot_mode mode, const char *cmd)
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