[PATCHv4 2/5] arm: socfpga: Enable OCRAM ECC on startup.
Dinh Nguyen
dinguyen at opensource.altera.com
Fri Nov 7 12:32:10 PST 2014
Hi Thor,
On 11/07/2014 10:54 AM, tthayer at opensource.altera.com wrote:
> From: Thor Thayer <tthayer at opensource.altera.com>
>
> 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 at opensource.altera.com>
> ---
> 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 at opensource.altera.com>
> 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 at gmail.com>
> 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
>
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