[U-Boot] [PATCH 1/2] arm: imx6: Add DDR3 calibration code for MX6 Q/D/DL
Marek Vasut
marex at denx.de
Wed Dec 16 15:40:06 CET 2015
Add DDR3 calibration code for i.MX6Q, i.MX6D and i.MX6DL. This code
fine-tunes the behavior of the MMDC controller in order to improve
the signal integrity and memory stability.
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Stefano Babic <sbabic at denx.de>
---
arch/arm/cpu/armv7/mx6/ddr.c | 559 ++++++++++++++++++++++++++++++++
arch/arm/include/asm/arch-mx6/mx6-ddr.h | 5 +
2 files changed, 564 insertions(+)
diff --git a/arch/arm/cpu/armv7/mx6/ddr.c b/arch/arm/cpu/armv7/mx6/ddr.c
index 6b039e4..194411f 100644
--- a/arch/arm/cpu/armv7/mx6/ddr.c
+++ b/arch/arm/cpu/armv7/mx6/ddr.c
@@ -13,6 +13,565 @@
#include <asm/io.h>
#include <asm/types.h>
+#if defined(CONFIG_MX6QDL) || defined(CONFIG_MX6Q) || defined(CONFIG_MX6D)
+
+static int wait_for_bit(void *reg, const uint32_t mask, bool set)
+{
+ unsigned int timeout = 1000;
+ u32 val;
+
+ while (--timeout) {
+ val = readl(reg);
+ if (!set)
+ val = ~val;
+
+ if ((val & mask) == mask)
+ return 0;
+
+ udelay(1);
+ }
+
+ printf("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n",
+ __func__, reg, mask, set);
+ hang(); /* DRAM couldn't be calibrated, game over :-( */
+}
+
+static void reset_read_data_fifos(void)
+{
+ struct mmdc_p_regs *mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
+
+ /* Reset data FIFOs twice. */
+ setbits_le32(&mmdc0->mpdgctrl0, 1 << 31);
+ wait_for_bit(&mmdc0->mpdgctrl0, 1 << 31, 0);
+
+ setbits_le32(&mmdc0->mpdgctrl0, 1 << 31);
+ wait_for_bit(&mmdc0->mpdgctrl0, 1 << 31, 0);
+}
+
+static void precharge_all(const bool cs0_enable, const bool cs1_enable)
+{
+ struct mmdc_p_regs *mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
+
+ /*
+ * Issue the Precharge-All command to the DDR device for both
+ * chip selects. Note, CON_REQ bit should also remain set. If
+ * only using one chip select, then precharge only the desired
+ * chip select.
+ */
+ if (cs0_enable) { /* CS0 */
+ writel(0x04008050, &mmdc0->mdscr);
+ wait_for_bit(&mmdc0->mdscr, 1 << 14, 1);
+ }
+
+ if (cs1_enable) { /* CS1 */
+ writel(0x04008058, &mmdc0->mdscr);
+ wait_for_bit(&mmdc0->mdscr, 1 << 14, 1);
+ }
+}
+
+static void force_delay_measurement(int bus_size)
+{
+ struct mmdc_p_regs *mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
+ struct mmdc_p_regs *mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR;
+
+ writel(0x800, &mmdc0->mpmur0);
+ if (bus_size == 0x2)
+ writel(0x800, &mmdc1->mpmur0);
+}
+
+static void modify_dg_result(u32 *reg_st0, u32 *reg_st1, u32 *reg_ctrl)
+{
+ u32 dg_tmp_val, dg_dl_abs_offset, dg_hc_del, val_ctrl;
+
+ /*
+ * DQS gating absolute offset should be modified from reflecting
+ * (HW_DG_LOWx + HW_DG_UPx)/2 to reflecting (HW_DG_UPx - 0x80)
+ */
+
+ val_ctrl = readl(reg_ctrl);
+ val_ctrl &= 0xf0000000;
+
+ dg_tmp_val = ((readl(reg_st0) & 0x07ff0000) >> 16) - 0xc0;
+ dg_dl_abs_offset = dg_tmp_val & 0x7f;
+ dg_hc_del = (dg_tmp_val & 0x780) << 1;
+
+ val_ctrl |= dg_dl_abs_offset + dg_hc_del;
+
+ dg_tmp_val = ((readl(reg_st1) & 0x07ff0000) >> 16) - 0xc0;
+ dg_dl_abs_offset = dg_tmp_val & 0x7f;
+ dg_hc_del = (dg_tmp_val & 0x780) << 1;
+
+ val_ctrl |= (dg_dl_abs_offset + dg_hc_del) << 16;
+
+ writel(val_ctrl, reg_ctrl);
+}
+
+int mmdc_do_write_level_calibration(void)
+{
+ struct mmdc_p_regs *mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
+ struct mmdc_p_regs *mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR;
+ u32 esdmisc_val, zq_val;
+ u32 errors = 0;
+ u32 ldectrl[4];
+ u32 ddr_mr1 = 0x4;
+
+ /*
+ * Stash old values in case calibration fails,
+ * we need to restore them
+ */
+ ldectrl[0] = readl(&mmdc0->mpwldectrl0);
+ ldectrl[1] = readl(&mmdc0->mpwldectrl1);
+ ldectrl[2] = readl(&mmdc1->mpwldectrl0);
+ ldectrl[3] = readl(&mmdc1->mpwldectrl1);
+
+ /* disable DDR logic power down timer */
+ clrbits_le32(&mmdc0->mdpdc, 0xff00);
+
+ /* disable Adopt power down timer */
+ setbits_le32(&mmdc0->mapsr, 0x1);
+
+ debug("Starting write leveling calibration.\n");
+
+ /*
+ * 2. disable auto refresh and ZQ calibration
+ * before proceeding with Write Leveling calibration
+ */
+ esdmisc_val = readl(&mmdc0->mdref);
+ writel(0x0000C000, &mmdc0->mdref);
+ zq_val = readl(&mmdc0->mpzqhwctrl);
+ writel(zq_val & ~0x3, &mmdc0->mpzqhwctrl);
+
+ /* 3. increase walat and ralat to maximum */
+ setbits_le32(&mmdc0->mdmisc,
+ (1 << 6) | (1 << 7) | (1 << 8) | (1 << 16) | (1 << 17));
+ setbits_le32(&mmdc1->mdmisc,
+ (1 << 6) | (1 << 7) | (1 << 8) | (1 << 16) | (1 << 17));
+ /*
+ * 4 & 5. Configure the external DDR device to enter write-leveling
+ * mode through Load Mode Register command.
+ * Register setting:
+ * Bits[31:16] MR1 value (0x0080 write leveling enable)
+ * Bit[9] set WL_EN to enable MMDC DQS output
+ * Bits[6:4] set CMD bits for Load Mode Register programming
+ * Bits[2:0] set CMD_BA to 0x1 for DDR MR1 programming
+ */
+ writel(0x00808231, &mmdc0->mdscr);
+
+ /* 6. Activate automatic calibration by setting MPWLGCR[HW_WL_EN] */
+ writel(0x00000001, &mmdc0->mpwlgcr);
+
+ /*
+ * 7. Upon completion of this process the MMDC de-asserts
+ * the MPWLGCR[HW_WL_EN]
+ */
+ wait_for_bit(&mmdc0->mpwlgcr, 1 << 0, 0);
+
+ /*
+ * 8. check for any errors: check both PHYs for x64 configuration,
+ * if x32, check only PHY0
+ */
+ if (readl(&mmdc0->mpwlgcr) & 0x00000F00)
+ errors |= 1;
+ if (readl(&mmdc1->mpwlgcr) & 0x00000F00)
+ errors |= 2;
+
+ debug("Ending write leveling calibration. Error mask: 0x%x\n", errors);
+
+ /* check to see if cal failed */
+ if ((readl(&mmdc0->mpwldectrl0) == 0x001F001F) &&
+ (readl(&mmdc0->mpwldectrl1) == 0x001F001F) &&
+ (readl(&mmdc1->mpwldectrl0) == 0x001F001F) &&
+ (readl(&mmdc1->mpwldectrl1) == 0x001F001F)) {
+ debug("Cal seems to have soft-failed due to memory not supporting write leveling on all channels. Restoring original write leveling values.\n");
+ writel(ldectrl[0], &mmdc0->mpwldectrl0);
+ writel(ldectrl[1], &mmdc0->mpwldectrl1);
+ writel(ldectrl[2], &mmdc1->mpwldectrl0);
+ writel(ldectrl[3], &mmdc1->mpwldectrl1);
+ errors |= 4;
+ }
+
+ /*
+ * User should issue MRS command to exit write leveling mode
+ * through Load Mode Register command
+ * Register setting:
+ * Bits[31:16] MR1 value "ddr_mr1" value from initialization
+ * Bit[9] clear WL_EN to disable MMDC DQS output
+ * Bits[6:4] set CMD bits for Load Mode Register programming
+ * Bits[2:0] set CMD_BA to 0x1 for DDR MR1 programming
+ */
+ writel((ddr_mr1 << 16) + 0x8031, &mmdc0->mdscr);
+
+ /* re-enable auto refresh and zq cal */
+ writel(esdmisc_val, &mmdc0->mdref);
+ writel(zq_val, &mmdc0->mpzqhwctrl);
+
+ debug("\tMMDC_MPWLDECTRL0 after write level cal: 0x%08X\n",
+ readl(&mmdc0->mpwldectrl0));
+ debug("\tMMDC_MPWLDECTRL1 after write level cal: 0x%08X\n",
+ readl(&mmdc0->mpwldectrl1));
+ debug("\tMMDC_MPWLDECTRL0 after write level cal: 0x%08X\n",
+ readl(&mmdc1->mpwldectrl0));
+ debug("\tMMDC_MPWLDECTRL1 after write level cal: 0x%08X\n",
+ readl(&mmdc1->mpwldectrl1));
+
+ /* We must force a readback of these values, to get them to stick */
+ readl(&mmdc0->mpwldectrl0);
+ readl(&mmdc0->mpwldectrl1);
+ readl(&mmdc1->mpwldectrl0);
+ readl(&mmdc1->mpwldectrl1);
+
+ /* enable DDR logic power down timer: */
+ setbits_le32(&mmdc0->mdpdc, 0x00005500);
+
+ /* Enable Adopt power down timer: */
+ clrbits_le32(&mmdc0->mapsr, 0x1);
+
+ /* Clear CON_REQ */
+ writel(0, &mmdc0->mdscr);
+
+ return errors;
+}
+
+int mmdc_do_dqs_calibration(void)
+{
+ struct mmdc_p_regs *mmdc0 = (struct mmdc_p_regs *)MMDC_P0_BASE_ADDR;
+ struct mmdc_p_regs *mmdc1 = (struct mmdc_p_regs *)MMDC_P1_BASE_ADDR;
+ struct mx6dq_iomux_ddr_regs *mx6_ddr_iomux =
+ (struct mx6dq_iomux_ddr_regs *)MX6DQ_IOM_DDR_BASE;
+ bool cs0_enable;
+ bool cs1_enable;
+ bool cs0_enable_initial;
+ bool cs1_enable_initial;
+ u32 esdmisc_val;
+ u32 bus_size;
+ u32 temp_ref;
+ u32 pddword = 0x00ffff00; /* best so far, place into MPPDCMPR1 */
+ u32 errors = 0;
+ u32 initdelay = 0x40404040;
+
+ /* check to see which chip selects are enabled */
+ cs0_enable_initial = readl(&mmdc0->mdctl) & 0x80000000;
+ cs1_enable_initial = readl(&mmdc0->mdctl) & 0x40000000;
+
+ /* disable DDR logic power down timer: */
+ clrbits_le32(&mmdc0->mdpdc, 0xff00);
+
+ /* disable Adopt power down timer: */
+ setbits_le32(&mmdc0->mapsr, 0x1);
+
+ /* set DQS pull ups */
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs0, 0x7000);
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs1, 0x7000);
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs2, 0x7000);
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs3, 0x7000);
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs4, 0x7000);
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs5, 0x7000);
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs6, 0x7000);
+ setbits_le32(&mx6_ddr_iomux->dram_sdqs7, 0x7000);
+
+ /* Save old RALAT and WALAT values */
+ esdmisc_val = readl(&mmdc0->mdmisc);
+
+ setbits_le32(&mmdc0->mdmisc,
+ (1 << 6) | (1 << 7) | (1 << 8) | (1 << 16) | (1 << 17));
+
+ /* Disable auto refresh before proceeding with calibration */
+ temp_ref = readl(&mmdc0->mdref);
+ writel(0x0000c000, &mmdc0->mdref);
+
+ /*
+ * Per the ref manual, issue one refresh cycle MDSCR[CMD]= 0x2,
+ * this also sets the CON_REQ bit.
+ */
+ if (cs0_enable_initial)
+ writel(0x00008020, &mmdc0->mdscr);
+ if (cs1_enable_initial)
+ writel(0x00008028, &mmdc0->mdscr);
+
+ /* poll to make sure the con_ack bit was asserted */
+ wait_for_bit(&mmdc0->mdscr, 1 << 14, 1);
+
+ /*
+ * Check MDMISC register CALIB_PER_CS to see which CS calibration
+ * is targeted to (under normal cases, it should be cleared
+ * as this is the default value, indicating calibration is directed
+ * to CS0).
+ * Disable the other chip select not being target for calibration
+ * to avoid any potential issues. This will get re-enabled at end
+ * of calibration.
+ */
+ if ((readl(&mmdc0->mdmisc) & 0x00100000) == 0)
+ clrbits_le32(&mmdc0->mdctl, 1 << 30); /* clear SDE_1 */
+ else
+ clrbits_le32(&mmdc0->mdctl, 1 << 31); /* clear SDE_0 */
+
+ /*
+ * Check to see which chip selects are now enabled for
+ * the remainder of the calibration.
+ */
+ cs0_enable = readl(&mmdc0->mdctl) & 0x80000000;
+ cs1_enable = readl(&mmdc0->mdctl) & 0x40000000;
+
+ /* Check to see what the data bus size is */
+ bus_size = (readl(&mmdc0->mdctl) & 0x30000) >> 16;
+ debug("Data bus size: %d (%d bits)\n", bus_size, 1 << (bus_size + 4));
+
+ precharge_all(cs0_enable, cs1_enable);
+
+ /* Write the pre-defined value into MPPDCMPR1 */
+ writel(pddword, &mmdc0->mppdcmpr1);
+
+ /*
+ * Issue a write access to the external DDR device by setting
+ * the bit SW_DUMMY_WR (bit 0) in the MPSWDAR0 and then poll
+ * this bit until it clears to indicate completion of the write access.
+ */
+ setbits_le32(&mmdc0->mpswdar0, 1);
+ wait_for_bit(&mmdc0->mpswdar0, 1 << 0, 0);
+
+ /* Set the RD_DL_ABS# bits to their default values
+ * (will be calibrated later in the read delay-line calibration).
+ * Both PHYs for x64 configuration, if x32, do only PHY0.
+ */
+ writel(initdelay, &mmdc0->mprddlctl);
+ if (bus_size == 0x2)
+ writel(initdelay, &mmdc1->mprddlctl);
+
+ /* Force a measurment, for previous delay setup to take effect. */
+ force_delay_measurement(bus_size);
+
+ /*
+ * ***************************
+ * Read DQS Gating calibration
+ * ***************************
+ */
+ debug("Starting Read DQS Gating calibration.\n");
+
+ /*
+ * Reset the read data FIFOs (two resets); only need to issue reset
+ * to PHY0 since in x64 mode, the reset will also go to PHY1.
+ */
+ reset_read_data_fifos();
+
+ /*
+ * Start the automatic read DQS gating calibration process by
+ * asserting MPDGCTRL0[HW_DG_EN] and MPDGCTRL0[DG_CMP_CYC]
+ * and then poll MPDGCTRL0[HW_DG_EN]] until this bit clears
+ * to indicate completion.
+ * Also, ensure that MPDGCTRL0[HW_DG_ERR] is clear to indicate
+ * no errors were seen during calibration.
+ */
+
+ /*
+ * Set bit 30: chooses option to wait 32 cycles instead of
+ * 16 before comparing read data.
+ */
+ setbits_le32(&mmdc0->mpdgctrl0, 1 << 30);
+
+ /* Set bit 28 to start automatic read DQS gating calibration */
+ setbits_le32(&mmdc0->mpdgctrl0, 5 << 28);
+
+ /* Poll for completion. MPDGCTRL0[HW_DG_EN] should be 0 */
+ wait_for_bit(&mmdc0->mpdgctrl0, 1 << 28, 0);
+
+ /*
+ * Check to see if any errors were encountered during calibration
+ * (check MPDGCTRL0[HW_DG_ERR]).
+ * Check both PHYs for x64 configuration, if x32, check only PHY0.
+ */
+ if (readl(&mmdc0->mpdgctrl0) & 0x00001000)
+ errors |= 1;
+
+ if ((bus_size == 0x2) && (readl(&mmdc1->mpdgctrl0) & 0x00001000))
+ errors |= 2;
+
+ /*
+ * DQS gating absolute offset should be modified from
+ * reflecting (HW_DG_LOWx + HW_DG_UPx)/2 to
+ * reflecting (HW_DG_UPx - 0x80)
+ */
+ modify_dg_result(&mmdc0->mpdghwst0, &mmdc0->mpdghwst1,
+ &mmdc0->mpdgctrl0);
+ modify_dg_result(&mmdc0->mpdghwst2, &mmdc0->mpdghwst3,
+ &mmdc0->mpdgctrl1);
+ if (bus_size == 0x2) {
+ modify_dg_result(&mmdc1->mpdghwst0, &mmdc1->mpdghwst1,
+ &mmdc1->mpdgctrl0);
+ modify_dg_result(&mmdc1->mpdghwst2, &mmdc1->mpdghwst3,
+ &mmdc1->mpdgctrl1);
+ }
+ debug("Ending Read DQS Gating calibration. Error mask: 0x%x\n", errors);
+
+ /*
+ * **********************
+ * Read Delay calibration
+ * **********************
+ */
+ debug("Starting Read Delay calibration.\n");
+
+ reset_read_data_fifos();
+
+ /*
+ * 4. Issue the Precharge-All command to the DDR device for both
+ * chip selects. If only using one chip select, then precharge
+ * only the desired chip select.
+ */
+ precharge_all(cs0_enable, cs1_enable);
+
+ /*
+ * 9. Read delay-line calibration
+ * Start the automatic read calibration process by asserting
+ * MPRDDLHWCTL[HW_RD_DL_EN].
+ */
+ writel(0x00000030, &mmdc0->mprddlhwctl);
+
+ /*
+ * 10. poll for completion
+ * MMDC indicates that the write data calibration had finished by
+ * setting MPRDDLHWCTL[HW_RD_DL_EN] = 0. Also, ensure that
+ * no error bits were set.
+ */
+ wait_for_bit(&mmdc0->mprddlhwctl, 1 << 4, 0);
+
+ /* check both PHYs for x64 configuration, if x32, check only PHY0 */
+ if (readl(&mmdc0->mprddlhwctl) & 0x0000000f)
+ errors |= 4;
+
+ if ((bus_size == 0x2) && (readl(&mmdc1->mprddlhwctl) & 0x0000000f))
+ errors |= 8;
+
+ debug("Ending Read Delay calibration. Error mask: 0x%x\n", errors);
+
+ /*
+ * ***********************
+ * Write Delay Calibration
+ * ***********************
+ */
+ debug("Starting Write Delay calibration.\n");
+
+ reset_read_data_fifos();
+
+ /*
+ * 4. Issue the Precharge-All command to the DDR device for both
+ * chip selects. If only using one chip select, then precharge
+ * only the desired chip select.
+ */
+ precharge_all(cs0_enable, cs1_enable);
+
+ /*
+ * 8. Set the WR_DL_ABS# bits to their default values.
+ * Both PHYs for x64 configuration, if x32, do only PHY0.
+ */
+ writel(initdelay, &mmdc0->mpwrdlctl);
+ if (bus_size == 0x2)
+ writel(initdelay, &mmdc1->mpwrdlctl);
+
+ /*
+ * XXX This isn't in the manual. Force a measurement,
+ * for previous delay setup to effect.
+ */
+ force_delay_measurement(bus_size);
+
+ /*
+ * 9. 10. Start the automatic write calibration process
+ * by asserting MPWRDLHWCTL0[HW_WR_DL_EN].
+ */
+ writel(0x00000030, &mmdc0->mpwrdlhwctl);
+
+ /*
+ * Poll for completion.
+ * MMDC indicates that the write data calibration had finished
+ * by setting MPWRDLHWCTL[HW_WR_DL_EN] = 0.
+ * Also, ensure that no error bits were set.
+ */
+ wait_for_bit(&mmdc0->mpwrdlhwctl, 1 << 4, 0);
+
+ /* Check both PHYs for x64 configuration, if x32, check only PHY0 */
+ if (readl(&mmdc0->mpwrdlhwctl) & 0x0000000f)
+ errors |= 16;
+
+ if ((bus_size == 0x2) && (readl(&mmdc1->mpwrdlhwctl) & 0x0000000f))
+ errors |= 32;
+
+ debug("Ending Write Delay calibration. Error mask: 0x%x\n", errors);
+
+ reset_read_data_fifos();
+
+ /* Enable DDR logic power down timer */
+ setbits_le32(&mmdc0->mdpdc, 0x00005500);
+
+ /* Enable Adopt power down timer */
+ clrbits_le32(&mmdc0->mapsr, 0x1);
+
+ /* Restore MDMISC value (RALAT, WALAT) to MMDCP1 */
+ writel(esdmisc_val, &mmdc0->mdmisc);
+
+ /* Clear DQS pull ups */
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs0, 0x7000);
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs1, 0x7000);
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs2, 0x7000);
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs3, 0x7000);
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs4, 0x7000);
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs5, 0x7000);
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs6, 0x7000);
+ clrbits_le32(&mx6_ddr_iomux->dram_sdqs7, 0x7000);
+
+ /* Re-enable SDE (chip selects) if they were set initially */
+ if (cs1_enable_initial)
+ /* Set SDE_1 */
+ setbits_le32(&mmdc0->mdctl, 1 << 30);
+
+ if (cs0_enable_initial)
+ /* Set SDE_0 */
+ setbits_le32(&mmdc0->mdctl, 1 << 31);
+
+ /* Re-enable to auto refresh */
+ writel(temp_ref, &mmdc0->mdref);
+
+ /* Clear the MDSCR (including the con_req bit) */
+ writel(0x0, &mmdc0->mdscr); /* CS0 */
+
+ /* Poll to make sure the con_ack bit is clear */
+ wait_for_bit(&mmdc0->mdscr, 1 << 14, 0);
+
+ /*
+ * Print out the registers that were updated as a result
+ * of the calibration process.
+ */
+ debug("MMDC registers updated from calibration\n");
+ debug("Read DQS gating calibration:\n");
+ debug("\tMPDGCTRL0 PHY0 = 0x%08X\n", readl(&mmdc0->mpdgctrl0));
+ debug("\tMPDGCTRL1 PHY0 = 0x%08X\n", readl(&mmdc0->mpdgctrl1));
+ debug("\tMPDGCTRL0 PHY1 = 0x%08X\n", readl(&mmdc1->mpdgctrl0));
+ debug("\tMPDGCTRL1 PHY1 = 0x%08X\n", readl(&mmdc1->mpdgctrl1));
+ debug("Read calibration:\n");
+ debug("\tMPRDDLCTL PHY0 = 0x%08X\n", readl(&mmdc0->mprddlctl));
+ debug("\tMPRDDLCTL PHY1 = 0x%08X\n", readl(&mmdc1->mprddlctl));
+ debug("Write calibration:\n");
+ debug("\tMPWRDLCTL PHY0 = 0x%08X\n", readl(&mmdc0->mpwrdlctl));
+ debug("\tMPWRDLCTL PHY1 = 0x%08X\n", readl(&mmdc1->mpwrdlctl));
+
+ /*
+ * Registers below are for debugging purposes. These print out
+ * the upper and lower boundaries captured during
+ * read DQS gating calibration.
+ */
+ debug("Status registers bounds for read DQS gating:\n");
+ debug("\tMPDGHWST0 PHY0 = 0x%08x\n", readl(&mmdc0->mpdghwst0));
+ debug("\tMPDGHWST1 PHY0 = 0x%08x\n", readl(&mmdc0->mpdghwst1));
+ debug("\tMPDGHWST2 PHY0 = 0x%08x\n", readl(&mmdc0->mpdghwst2));
+ debug("\tMPDGHWST3 PHY0 = 0x%08x\n", readl(&mmdc0->mpdghwst3));
+ debug("\tMPDGHWST0 PHY1 = 0x%08x\n", readl(&mmdc1->mpdghwst0));
+ debug("\tMPDGHWST1 PHY1 = 0x%08x\n", readl(&mmdc1->mpdghwst1));
+ debug("\tMPDGHWST2 PHY1 = 0x%08x\n", readl(&mmdc1->mpdghwst2));
+ debug("\tMPDGHWST3 PHY1 = 0x%08x\n", readl(&mmdc1->mpdghwst3));
+
+ debug("Final do_dqs_calibration error mask: 0x%x\n", errors);
+
+ return errors;
+}
+#endif
+
#if defined(CONFIG_MX6SX)
/* Configure MX6SX mmdc iomux */
void mx6sx_dram_iocfg(unsigned width,
diff --git a/arch/arm/include/asm/arch-mx6/mx6-ddr.h b/arch/arm/include/asm/arch-mx6/mx6-ddr.h
index 68d9bda..12c30d2 100644
--- a/arch/arm/include/asm/arch-mx6/mx6-ddr.h
+++ b/arch/arm/include/asm/arch-mx6/mx6-ddr.h
@@ -456,6 +456,11 @@ void mx6sl_dram_iocfg(unsigned width,
const struct mx6sl_iomux_ddr_regs *,
const struct mx6sl_iomux_grp_regs *);
+#if defined(CONFIG_MX6QDL) || defined(CONFIG_MX6Q) || defined(CONFIG_MX6D)
+int mmdc_do_write_level_calibration(void);
+int mmdc_do_dqs_calibration(void);
+#endif
+
/* configure mx6 mmdc registers */
void mx6_dram_cfg(const struct mx6_ddr_sysinfo *,
const struct mx6_mmdc_calibration *,
--
2.1.4
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