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authorThor Thayer <tthayer@opensource.altera.com>2016-02-10 13:26:24 -0600
committerBorislav Petkov <bp@suse.de>2016-02-11 12:34:38 +0100
commit7cc5a5d3cd4cca0a3852d1500e8c50fe191bcc9d (patch)
tree9249f5b90cfef92258847491139d8303b248e102
parent4d1138380ed6f1cca622e7de8bcc877c04a52d0d (diff)
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>
-rw-r--r--arch/arm/mach-socfpga/Makefile1
-rw-r--r--arch/arm/mach-socfpga/core.h1
-rw-r--r--arch/arm/mach-socfpga/ocram.c49
-rw-r--r--arch/arm/mach-socfpga/socfpga.c3
4 files changed, 54 insertions, 0 deletions
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 <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);
+}
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)