On Tue, 1 Mar 2016, tthayer@xxxxxxxxxxxxxxxxxxxxx wrote: > From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx> > > Enable ECC for Arria10 L2 cache 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@xxxxxxxxxxxxxxxxxxxxx> > --- > arch/arm/mach-socfpga/l2_cache.c | 42 ++++++++++++++++++++++++++++++++++---- > 1 file changed, 38 insertions(+), 4 deletions(-) > > diff --git a/arch/arm/mach-socfpga/l2_cache.c b/arch/arm/mach-socfpga/l2_cache.c > index e3907ab..b197218 100644 > --- a/arch/arm/mach-socfpga/l2_cache.c > +++ b/arch/arm/mach-socfpga/l2_cache.c > @@ -17,14 +17,31 @@ > #include <linux/of_platform.h> > #include <linux/of_address.h> > > +#include "core.h" > + > +/* A10 System Manager ECC interrupt mask control registers */ > +#define A10_L2_ECC_CTRL_OFST 0x0 > + > +#define A10_SYSMGR_ECC_INTMASK_CLR_OFST 0x98 > +#define A10_L2_ECC_INT_CLR_OFST 0xA8 > + > +#define A10_MPU_CTRL_L2_ECC_EN BIT(0) > +#define A10_ECC_INTMASK_CLR_EN BIT(0) > +#define A10_ECC_INT_CLR (BIT(31) | BIT(15)) > + > void socfpga_init_l2_ecc(void) > { > struct device_node *np; > void __iomem *mapped_l2_edac_addr; > + const char *compat = "altr,socfpga-l2-ecc"; > > - np = of_find_compatible_node(NULL, NULL, "altr,socfpga-l2-ecc"); > + if (of_machine_is_compatible("altr,socfpga-arria10")) > + compat = "altr,socfpga-a10-l2-ecc"; The ARM maintainers have made comment to me about about trying to not sprinkle these of_machine_is_compatible() all over the place. You should make the decision during the initial probe of the machine. Please look at how the .restart is differentiate between the 2 platforms. > + > + /* Find the L2 EDAC device tree node */ > + np = of_find_compatible_node(NULL, NULL, compat); > if (!np) { > - pr_err("Unable to find socfpga-l2-ecc in dtb\n"); > + pr_err("Unable to find %s in dtb\n", compat); > return; > } > > @@ -35,7 +52,24 @@ void socfpga_init_l2_ecc(void) > return; > } > > - /* Enable ECC */ > - writel(0x01, mapped_l2_edac_addr); > + if (of_machine_is_compatible("altr,socfpga-arria10")) { Same comment as above here. BR, Dinh -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html