Hi Thor, On 11/07/2014 10:54 AM, tthayer@xxxxxxxxxxxxxxxxxxxxx wrote: > From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> > > This patch enables the ECC for On-Chip RAM on machine > startup. The ECC has to be enabled before data is > is stored in memory otherwise the ECC will fail on > reads. > > Signed-off-by: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> > --- > v2: Split OCRAM ECC portion separately. Addition of iounmap() > and reorganization of gen_pool_free. Remove defconfig from patch. > > v3/4: No change > --- > MAINTAINERS | 1 + > arch/arm/mach-socfpga/Makefile | 1 + > arch/arm/mach-socfpga/ocram.c | 90 +++++++++++++++++++++++++++++++++++++++ > arch/arm/mach-socfpga/ocram.h | 28 ++++++++++++ > arch/arm/mach-socfpga/socfpga.c | 8 ++++ > 5 files changed, 128 insertions(+) > create mode 100644 arch/arm/mach-socfpga/ocram.c > create mode 100644 arch/arm/mach-socfpga/ocram.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index d0c7752..c6d390e 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1408,6 +1408,7 @@ M: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> > S: Maintained > F: drivers/edac/altera_edac. > F: arch/arm/mach-socfpga/l2_cache.* > +F: arch/arm/mach-socfpga/ocram.* I think you can remove these entries for l2_cache.c and ocram.c since it already falls under mach-socfpga/, which I already maintain. > > ARM/STI ARCHITECTURE > M: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxx> > diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile > index 142609e..1552ca5 100644 > --- a/arch/arm/mach-socfpga/Makefile > +++ b/arch/arm/mach-socfpga/Makefile > @@ -5,3 +5,4 @@ > obj-y := socfpga.o > obj-$(CONFIG_SMP) += headsmp.o platsmp.o > obj-$(CONFIG_EDAC_ALTERA_L2C) += l2_cache.o > +obj-$(CONFIG_EDAC_ALTERA_OCRAM) += ocram.o > diff --git a/arch/arm/mach-socfpga/ocram.c b/arch/arm/mach-socfpga/ocram.c > new file mode 100644 > index 0000000..9136009 > --- /dev/null > +++ b/arch/arm/mach-socfpga/ocram.c > @@ -0,0 +1,90 @@ > +/* > + * Copyright Altera Corporation (C) 2014. 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/clk-provider.h> Why clk-provider.h and not io.h? > +#include <linux/genalloc.h> > +#include <linux/of_platform.h> > + > +#include "ocram.h" > + > +void socfpga_init_ocram_ecc(void) > +{ > + struct device_node *np; > + const __be32 *prop; > + u32 ocr_edac_addr, iram_addr, len; > + void __iomem *mapped_ocr_edac_addr; > + size_t size; > + struct gen_pool *gp; > + > + np = of_find_compatible_node(NULL, NULL, "altr,ocram-edac"); > + if (!np) { > + pr_err("SOCFPGA: Unable to find altr,ocram-edac in dtb\n"); > + return; > + } > + > + prop = of_get_property(np, "reg", &size); > + ocr_edac_addr = be32_to_cpup(prop++); > + len = be32_to_cpup(prop); You should be checking for prop before calling be32_to_cpup. > + if (!prop || size < sizeof(*prop)) { Then you don't need check for prop here. > + pr_err("SOCFPGA: Unable to find OCRAM ECC mapping in dtb\n"); > + return; > + } > + > + gp = of_get_named_gen_pool(np, "iram", 0); > + if (!gp) { > + pr_err("SOCFPGA: OCRAM cannot find gen pool\n"); > + return; > + } > + > + np = of_find_compatible_node(NULL, NULL, "mmio-sram"); > + if (!np) { > + pr_err("SOCFPGA: Unable to find mmio-sram in dtb\n"); > + return; > + } > + /* Determine the OCRAM address and size */ > + prop = of_get_property(np, "reg", &size); > + iram_addr = be32_to_cpup(prop++); > + len = be32_to_cpup(prop); Same comment here for checking prop before calling be32_to_cpu. > + > + if (!prop || size < sizeof(*prop)) { > + pr_err("SOCFPGA: Unable to find OCRAM mapping in dtb\n"); > + return; > + } > + > + iram_addr = gen_pool_alloc(gp, len); > + if (iram_addr == 0) { > + pr_err("SOCFPGA: cannot alloc from gen pool\n"); > + return; > + } > + > + memset((void *)iram_addr, 0, len); > + > + gen_pool_free(gp, iram_addr, len); > + > + mapped_ocr_edac_addr = ioremap(ocr_edac_addr, 4); > + if (!mapped_ocr_edac_addr) { > + pr_err("SOCFPGA: Unable to map OCRAM ecc regs.\n"); > + return; > + } > + > + /* Clear any pending OCRAM ECC interrupts, then enable ECC */ > + writel(0x18, mapped_ocr_edac_addr); > + writel(0x19, mapped_ocr_edac_addr); Can you add a define for 0x18 and 0x19? What do these values mean? > + > + iounmap(mapped_ocr_edac_addr); > + > + pr_debug("SOCFPGA: Success Initializing OCRAM\n"); > +} > + > diff --git a/arch/arm/mach-socfpga/ocram.h b/arch/arm/mach-socfpga/ocram.h > new file mode 100644 > index 0000000..f93cf84 > --- /dev/null > +++ b/arch/arm/mach-socfpga/ocram.h > @@ -0,0 +1,28 @@ > +/* > + * Copyright Altera Corporation (C) 2014. 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/>. > + */ > + > +#ifndef MACH_SOCFPGA_OCRAM_H > +#define MACH_SOCFPGA_OCRAM_H > + > +#ifdef CONFIG_EDAC_ALTERA_OCRAM > +void socfpga_init_ocram_ecc(void); > +#else > +inline void socfpga_init_ocram_ecc(void) > +{ > +} > +#endif > + > +#endif /* #ifndef MACH_SOCFPGA_OCRAM_H */ > diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c > index af6413a..fb41aca 100644 > --- a/arch/arm/mach-socfpga/socfpga.c > +++ b/arch/arm/mach-socfpga/socfpga.c > @@ -101,6 +101,13 @@ static void socfpga_cyclone5_restart(enum reboot_mode mode, const char *cmd) > writel(temp, rst_manager_base_addr + SOCFPGA_RSTMGR_CTRL); > } > > +static void __init socfpga_cyclone5_init(void) > +{ > + of_platform_populate(NULL, of_default_bus_match_table, > + NULL, NULL); > + socfpga_init_ocram_ecc(); Use IS_ENABLED() here, so you can remove the need to have ocram.h. You can put the function declaration in core.h. Dinh > +} > + > static const char *altera_dt_match[] = { > "altr,socfpga", > NULL > @@ -112,6 +119,7 @@ DT_MACHINE_START(SOCFPGA, "Altera SOCFPGA") > .smp = smp_ops(socfpga_smp_ops), > .map_io = socfpga_map_io, > .init_irq = socfpga_init_irq, > + .init_machine = socfpga_cyclone5_init, > .restart = socfpga_cyclone5_restart, > .dt_compat = altera_dt_match, > MACHINE_END > -- 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
