On Fri, Jan 09, 2015 at 02:53:52AM +0000, tthayer@xxxxxxxxxxxxxxxxxxxxx wrote: > From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> > > 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. I take it you mean before the L2 cache is enabled (and its memories are used), rather than before main memory is in use? > > Signed-off-by: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> > --- > v2: Split OCRAM initialization into separate patch. > > v3/4: No change > > v5: Remove l2cache.h, use io.h instead of clk-provider.h > Make copyright header inclusive. Remove MAINTAINERS entry. > > v6: Remove pr_debug() & update year in header. > --- > arch/arm/mach-socfpga/Makefile | 1 + > arch/arm/mach-socfpga/core.h | 2 ++ > arch/arm/mach-socfpga/l2_cache.c | 39 ++++++++++++++++++++++++++++++++++++++ > arch/arm/mach-socfpga/socfpga.c | 4 +++- > 4 files changed, 45 insertions(+), 1 deletion(-) > create mode 100644 arch/arm/mach-socfpga/l2_cache.c > > 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/core.h b/arch/arm/mach-socfpga/core.h > index 483cb46..28c8a15 100644 > --- a/arch/arm/mach-socfpga/core.h > +++ b/arch/arm/mach-socfpga/core.h > @@ -47,4 +47,6 @@ extern unsigned long socfpga_cpu1start_addr; > > #define SOCFPGA_SCU_VIRT_BASE 0xfffec000 > > +void socfpga_init_l2_ecc(void); > + > #endif > diff --git a/arch/arm/mach-socfpga/l2_cache.c b/arch/arm/mach-socfpga/l2_cache.c > new file mode 100644 > index 0000000..047759d > --- /dev/null > +++ b/arch/arm/mach-socfpga/l2_cache.c > @@ -0,0 +1,39 @@ > +/* > + * Copyright Altera Corporation (C) 2015. 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/of_platform.h> > +#include <linux/of_address.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); Missing of_node_put(np)? Surely you're leaking the mapping here? It's locally scoped and you never unmap it. Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
