From: Thor Thayer <ttha...@opensource.altera.com> Enable ECC for Arria10 On-Chip RAM on machine startup. The ECC has to be enabled and memory initialized before data is stored in memory otherwise the ECC will fail on reads.
Signed-off-by: Thor Thayer <ttha...@opensource.altera.com> --- v2: Add Arria10 ECC block initialization locally. --- arch/arm/mach-socfpga/ocram.c | 128 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) diff --git a/arch/arm/mach-socfpga/ocram.c b/arch/arm/mach-socfpga/ocram.c index 60ec643..d4a524c 100644 --- a/arch/arm/mach-socfpga/ocram.c +++ b/arch/arm/mach-socfpga/ocram.c @@ -13,12 +13,15 @@ * 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/delay.h> #include <linux/io.h> #include <linux/genalloc.h> #include <linux/module.h> #include <linux/of_address.h> #include <linux/of_platform.h> +#include "core.h" + #define ALTR_OCRAM_CLEAR_ECC 0x00000018 #define ALTR_OCRAM_ECC_EN 0x00000019 @@ -47,3 +50,128 @@ void socfpga_init_ocram_ecc(void) iounmap(mapped_ocr_edac_addr); } + +/* Arria10 OCRAM Section */ +#define ALTR_A10_ECC_CTRL_OFST 0x08 +#define ALTR_A10_OCRAM_ECC_EN_CTL (BIT(1) | BIT(0)) +#define ALTR_A10_ECC_INITA BIT(16) + +#define ALTR_A10_ECC_INITSTAT_OFST 0x0C +#define ALTR_A10_ECC_INITCOMPLETEA BIT(0) +#define ALTR_A10_ECC_INITCOMPLETEB BIT(8) + +#define ALTR_A10_ECC_ERRINTEN_OFST 0x10 +#define ALTR_A10_ECC_SERRINTEN BIT(0) + +#define ALTR_A10_ECC_INTSTAT_OFST 0x20 +#define ALTR_A10_ECC_SERRPENA BIT(0) +#define ALTR_A10_ECC_DERRPENA BIT(8) +#define ALTR_A10_ECC_ERRPENA_MASK (ALTR_A10_ECC_SERRPENA | \ + ALTR_A10_ECC_DERRPENA) +/* ECC Manager Defines */ +#define A10_SYSMGR_ECC_INTMASK_SET_OFST 0x94 +#define A10_SYSMGR_ECC_INTMASK_CLR_OFST 0x98 +#define A10_SYSMGR_ECC_INTMASK_OCRAM BIT(1) + +#define ALTR_A10_ECC_INIT_WATCHDOG_10US 10000 + +static void ecc_set_bits(u32 bit_mask, void __iomem *ioaddr) +{ + u32 value = readl(ioaddr); + + value |= bit_mask; + writel(value, ioaddr); +} + +static void ecc_clear_bits(u32 bit_mask, void __iomem *ioaddr) +{ + u32 value = readl(ioaddr); + + value &= ~bit_mask; + writel(value, ioaddr); +} + +static int ecc_test_bits(u32 bit_mask, void __iomem *ioaddr) +{ + u32 value = readl(ioaddr); + + return (value & bit_mask) ? 1 : 0; +} + +/* + * This function uses the memory initialization block in the Arria10 ECC + * controller to initialize/clear the entire memory data and ECC data. + */ +static int altr_init_memory_port(void __iomem *ioaddr) +{ + int limit = ALTR_A10_ECC_INIT_WATCHDOG_10US; + + ecc_set_bits(ALTR_A10_ECC_INITA, (ioaddr + ALTR_A10_ECC_CTRL_OFST)); + while (limit--) { + if (ecc_test_bits(ALTR_A10_ECC_INITCOMPLETEA, + (ioaddr + ALTR_A10_ECC_INITSTAT_OFST))) + break; + udelay(1); + } + if (limit < 0) + return -EBUSY; + + /* Clear any pending ECC interrupts */ + writel(ALTR_A10_ECC_ERRPENA_MASK, + (ioaddr + ALTR_A10_ECC_INTSTAT_OFST)); + + return 0; +} + +void socfpga_init_arria10_ocram_ecc(void) +{ + struct device_node *np; + int ret = 0; + void __iomem *ecc_block_base; + + if (!sys_manager_base_addr) { + pr_err("SOCFPGA: sys-mgr is not initialized\n"); + return; + } + + /* Find the OCRAM EDAC device tree node */ + np = of_find_compatible_node(NULL, NULL, "altr,socfpga-a10-ocram-ecc"); + if (!np) { + pr_err("Unable to find socfpga-a10-ocram-ecc\n"); + return; + } + + /* Map the ECC Block */ + ecc_block_base = of_iomap(np, 0); + of_node_put(np); + if (!ecc_block_base) { + pr_err("Unable to map OCRAM ECC block\n"); + return; + } + + /* Disable ECC */ + writel(ALTR_A10_OCRAM_ECC_EN_CTL, + sys_manager_base_addr + A10_SYSMGR_ECC_INTMASK_SET_OFST); + ecc_clear_bits(ALTR_A10_ECC_SERRINTEN, + (ecc_block_base + ALTR_A10_ECC_ERRINTEN_OFST)); + ecc_clear_bits(ALTR_A10_OCRAM_ECC_EN_CTL, + (ecc_block_base + ALTR_A10_ECC_CTRL_OFST)); + + /* Use HW initialization block to initialize memory for ECC */ + ret = altr_init_memory_port(ecc_block_base); + if (ret) { + pr_err("ECC: cannot init OCRAM PORTA memory\n"); + return; + } + + /* Enable ECC */ + ecc_set_bits(ALTR_A10_OCRAM_ECC_EN_CTL, + (ecc_block_base + ALTR_A10_ECC_CTRL_OFST)); + ecc_set_bits(ALTR_A10_ECC_SERRINTEN, + (ecc_block_base + ALTR_A10_ECC_ERRINTEN_OFST)); + writel(ALTR_A10_OCRAM_ECC_EN_CTL, + sys_manager_base_addr + A10_SYSMGR_ECC_INTMASK_CLR_OFST); + + /* Ensure all writes complete */ + wmb(); +} -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
