arm: emif-common: Add suppport for enabling ECC
For data integrity, the EMIF1 supports ECC on the data
written or read from the SDRAM. Add support for enabling
ECC support in EMIF1.
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Krunal Bhargav <k-bhargav@ti.com>
diff --git a/arch/arm/mach-omap2/emif-common.c b/arch/arm/mach-omap2/emif-common.c
index 2b03dbe..e3ef37b 100644
--- a/arch/arm/mach-omap2/emif-common.c
+++ b/arch/arm/mach-omap2/emif-common.c
@@ -17,6 +17,7 @@
#include <asm/omap_sec_common.h>
#include <asm/utils.h>
#include <linux/compiler.h>
+#include <asm/ti-common/ti-edma3.h>
static int emif1_enabled = -1, emif2_enabled = -1;
@@ -332,6 +333,71 @@
update_hwleveling_output(base, regs);
}
+static void dra7_reset_ddr_data(u32 base, u32 size)
+{
+#if defined(CONFIG_TI_EDMA3) && !defined(CONFIG_DMA)
+ enable_edma3_clocks();
+
+ edma3_fill(EDMA3_BASE, 1, (void *)base, 0, size);
+
+ disable_edma3_clocks();
+#else
+ memset((void *)base, 0, size);
+#endif
+}
+
+static void dra7_enable_ecc(u32 base, const struct emif_regs *regs)
+{
+ struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
+ u32 rgn, size;
+
+ /* ECC available only on dra76x EMIF1 */
+ if ((base != EMIF1_BASE) || !is_dra76x())
+ return;
+
+ if (regs->emif_ecc_ctrl_reg & EMIF_ECC_CTRL_REG_ECC_EN_MASK) {
+ writel(regs->emif_ecc_address_range_1,
+ &emif->emif_ecc_address_range_1);
+ writel(regs->emif_ecc_address_range_2,
+ &emif->emif_ecc_address_range_2);
+ writel(regs->emif_ecc_ctrl_reg, &emif->emif_ecc_ctrl_reg);
+
+ /* Set region1 memory with 0 */
+ rgn = ((regs->emif_ecc_address_range_1 &
+ EMIF_ECC_REG_ECC_START_ADDR_MASK) << 16) +
+ CONFIG_SYS_SDRAM_BASE;
+ size = (regs->emif_ecc_address_range_1 &
+ EMIF_ECC_REG_ECC_END_ADDR_MASK) + 0x10000;
+
+ if (regs->emif_ecc_ctrl_reg &
+ EMIF_ECC_REG_ECC_ADDR_RGN_1_EN_MASK)
+ dra7_reset_ddr_data(rgn, size);
+
+ /* Set region2 memory with 0 */
+ rgn = ((regs->emif_ecc_address_range_2 &
+ EMIF_ECC_REG_ECC_START_ADDR_MASK) << 16) +
+ CONFIG_SYS_SDRAM_BASE;
+ size = (regs->emif_ecc_address_range_2 &
+ EMIF_ECC_REG_ECC_END_ADDR_MASK) + 0x10000;
+
+ if (regs->emif_ecc_ctrl_reg &
+ EMIF_ECC_REG_ECC_ADDR_RGN_2_EN_MASK)
+ dra7_reset_ddr_data(rgn, size);
+
+#ifdef CONFIG_DRA7XX
+ /* Clear the status flags and other history */
+ writel(readl(&emif->emif_1b_ecc_err_cnt),
+ &emif->emif_1b_ecc_err_cnt);
+ writel(0xffffffff, &emif->emif_1b_ecc_err_dist_1);
+ writel(0x1, &emif->emif_2b_ecc_err_addr_log);
+ writel(EMIF_INT_WR_ECC_ERR_SYS_MASK |
+ EMIF_INT_TWOBIT_ECC_ERR_SYS_MASK |
+ EMIF_INT_ONEBIT_ECC_ERR_SYS_MASK,
+ &emif->emif_irqstatus_sys);
+#endif
+ }
+}
+
static void dra7_ddr3_init(u32 base, const struct emif_regs *regs)
{
struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
@@ -368,8 +434,29 @@
writel(regs->ref_ctrl_final, &emif->emif_sdram_ref_ctrl);
- if (regs->emif_rd_wr_lvl_rmp_ctl & EMIF_REG_RDWRLVL_EN_MASK)
+ if (regs->emif_rd_wr_lvl_rmp_ctl & EMIF_REG_RDWRLVL_EN_MASK) {
+ /*
+ * Perform Dummy ECC setup just to allow hardware
+ * leveling of ECC memories
+ */
+ if (is_dra76x() && (base == EMIF1_BASE) &&
+ (regs->emif_ecc_ctrl_reg & EMIF_ECC_CTRL_REG_ECC_EN_MASK)) {
+ writel(0, &emif->emif_ecc_address_range_1);
+ writel(0, &emif->emif_ecc_address_range_2);
+ writel(EMIF_ECC_CTRL_REG_ECC_EN_MASK |
+ EMIF_ECC_CTRL_REG_ECC_ADDR_RGN_PROT_MASK,
+ &emif->emif_ecc_ctrl_reg);
+ }
+
dra7_ddr3_leveling(base, regs);
+
+ /* Disable ECC */
+ if (is_dra76x())
+ writel(0, &emif->emif_ecc_ctrl_reg);
+ }
+
+ /* Enable ECC as necessary */
+ dra7_enable_ecc(base, regs);
}
static void omap5_ddr3_init(u32 base, const struct emif_regs *regs)