driver/ddr/fsl: Add general MMDC driver and reuse common MMDC driver for ls1012a

This general MMDC driver adds basic support for Freescale MMDC
(Multi Mode DDR Controller). Currently MMDC is integrated on ARMv8
LS1012A SoC for DDR3L, there will be a update to this driver to
support more flexible configuration if new features (DDR4, multiple
controllers/chip selections, etc) are implimented in future.

Meantime, reuse common MMDC driver for LS1012ARDB/LS1012AQDS/
LS1012AFRDM.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

2 files changed, 157 insertions, 0 deletions

diff --git a/drivers/ddr/fsl/Makefile b/drivers/ddr/fsl/Makefile
index 01ea86217c..00dea428e3 100644
--- a/drivers/ddr/fsl/Makefile
+++ b/drivers/ddr/fsl/Makefile
@@ -33,3 +33,4 @@ obj-$(CONFIG_SYS_FSL_DDRC_GEN3)	+= mpc85xx_ddr_gen3.o
 obj-$(CONFIG_SYS_FSL_DDR_86XX)		+= mpc86xx_ddr.o
 obj-$(CONFIG_SYS_FSL_DDRC_ARM_GEN3)	+= arm_ddr_gen3.o
 obj-$(CONFIG_SYS_FSL_DDRC_GEN4) += fsl_ddr_gen4.o
+obj-$(CONFIG_SYS_FSL_MMDC) += fsl_mmdc.o
diff --git a/drivers/ddr/fsl/fsl_mmdc.c b/drivers/ddr/fsl/fsl_mmdc.c
new file mode 100644
index 0000000000..1e359674da
--- /dev/null
+++ b/drivers/ddr/fsl/fsl_mmdc.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+/*
+ * Generic driver for Freescale MMDC(Multi Mode DDR Controller).
+ */
+
+#include <common.h>
+#include <fsl_mmdc.h>
+#include <asm/io.h>
+
+static void set_wait_for_bits_clear(void *ptr, u32 value, u32 bits)
+{
+	int timeout = 1000;
+
+	out_be32(ptr, value);
+
+	while (in_be32(ptr) & bits) {
+		udelay(100);
+		timeout--;
+	}
+	if (timeout <= 0)
+		printf("Error: %p wait for clear timeout.\n", ptr);
+}
+
+void mmdc_init(void)
+{
+	struct mmdc_regs *mmdc = (struct mmdc_regs *)CONFIG_SYS_FSL_DDR_ADDR;
+	unsigned int tmp;
+
+	/* 1. set configuration request */
+	out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ);
+
+	/* 2. configure the desired timing parameters */
+	out_be32(&mmdc->mdotc,  CONFIG_MMDC_MDOTC);
+	out_be32(&mmdc->mdcfg0, CONFIG_MMDC_MDCFG0);
+	out_be32(&mmdc->mdcfg1, CONFIG_MMDC_MDCFG1);
+	out_be32(&mmdc->mdcfg2, CONFIG_MMDC_MDCFG2);
+
+	/* 3. configure DDR type and other miscellaneous parameters */
+	out_be32(&mmdc->mdmisc, CONFIG_MMDC_MDMISC);
+	out_be32(&mmdc->mpmur0,	MMDC_MPMUR0_FRC_MSR);
+	out_be32(&mmdc->mdrwd,  CONFIG_MMDC_MDRWD);
+	out_be32(&mmdc->mpodtctrl, CONFIG_MMDC_MPODTCTRL);
+
+	/* 4. configure the required delay while leaving reset */
+	out_be32(&mmdc->mdor,  CONFIG_MMDC_MDOR);
+
+	/* 5. configure DDR physical parameters */
+	/* set row/column address width, burst length, data bus width */
+	tmp = CONFIG_MMDC_MDCTL & ~(MDCTL_SDE0 | MDCTL_SDE1);
+	out_be32(&mmdc->mdctl, tmp);
+	/* configure address space partition */
+	out_be32(&mmdc->mdasp, CONFIG_MMDC_MDASP);
+
+	/* 6. perform a ZQ calibration - not needed here, doing in #8b */
+
+	/* 7. enable MMDC with the desired chip select */
+#if (CONFIG_CHIP_SELECTS_PER_CTRL == 1)
+		out_be32(&mmdc->mdctl, tmp | MDCTL_SDE0);
+#elif (CONFIG_CHIP_SELECTS_PER_CTRL == 2)
+		out_be32(&mmdc->mdctl, tmp | MDCTL_SDE0 | MDCTL_SDE1);
+#endif
+
+	/* 8a. dram init sequence: update MRs for ZQ, ODT, PRE, etc */
+	out_be32(&mmdc->mdscr,  CMD_ADDR_LSB_MR_ADDR(8) | MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_2);
+
+	out_be32(&mmdc->mdscr,  CMD_ADDR_LSB_MR_ADDR(0) | MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3);
+
+	out_be32(&mmdc->mdscr,  CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1);
+
+	out_be32(&mmdc->mdscr,  CMD_ADDR_MSB_MR_OP(0x19) |
+				CMD_ADDR_LSB_MR_ADDR(0x30) |
+				MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_0);
+
+	/* 8b. ZQ calibration */
+	out_be32(&mmdc->mdscr,  CMD_ADDR_MSB_MR_OP(0x4) | MDSCR_ENABLE_CON_REQ |
+				CMD_ZQ_CALIBRATION | CMD_BANK_ADDR_0);
+
+	set_wait_for_bits_clear(&mmdc->mpzqhwctrl, CONFIG_MMDC_MPZQHWCTRL,
+				MPZQHWCTRL_ZQ_HW_FORCE);
+
+	/* 9a. calibrations now, wr lvl */
+	out_be32(&mmdc->mdscr,  CMD_ADDR_LSB_MR_ADDR(0x84) |
+				MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1);
+
+	out_be32(&mmdc->mdscr,  MDSCR_ENABLE_CON_REQ | MDSCR_WL_EN |
+				CMD_NORMAL);
+
+	set_wait_for_bits_clear(&mmdc->mpwlgcr, MPWLGCR_HW_WL_EN,
+				MPWLGCR_HW_WL_EN);
+
+	mdelay(1);
+
+	out_be32(&mmdc->mdscr,  CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_1);
+	out_be32(&mmdc->mdscr, MDSCR_ENABLE_CON_REQ);
+
+	mdelay(1);
+
+	/* 9b. read DQS gating calibration */
+	out_be32(&mmdc->mdscr,  CMD_ADDR_MSB_MR_OP(4) | MDSCR_ENABLE_CON_REQ |
+				CMD_PRECHARGE_BANK_OPEN | CMD_BANK_ADDR_0);
+
+	out_be32(&mmdc->mdscr,  CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3);
+
+	out_be32(&mmdc->mppdcmpr2, MPPDCMPR2_MPR_COMPARE_EN);
+
+	/* set absolute read delay offset */
+#if defined(CONFIG_MMDC_MPRDDLCTL)
+	out_be32(&mmdc->mprddlctl, CONFIG_MMDC_MPRDDLCTL);
+#else
+	out_be32(&mmdc->mprddlctl, MMDC_MPRDDLCTL_DEFAULT_DELAY);
+#endif
+	set_wait_for_bits_clear(&mmdc->mpdgctrl0,
+				AUTO_RD_DQS_GATING_CALIBRATION_EN,
+				AUTO_RD_DQS_GATING_CALIBRATION_EN);
+
+	out_be32(&mmdc->mdscr,  MDSCR_ENABLE_CON_REQ | CMD_LOAD_MODE_REG |
+				CMD_BANK_ADDR_3);
+
+	/* 9c. read calibration */
+	out_be32(&mmdc->mdscr,  CMD_ADDR_MSB_MR_OP(4) | MDSCR_ENABLE_CON_REQ |
+				CMD_PRECHARGE_BANK_OPEN | CMD_BANK_ADDR_0);
+	out_be32(&mmdc->mdscr,  CMD_ADDR_LSB_MR_ADDR(4) | MDSCR_ENABLE_CON_REQ |
+				CMD_LOAD_MODE_REG | CMD_BANK_ADDR_3);
+	out_be32(&mmdc->mppdcmpr2,  MPPDCMPR2_MPR_COMPARE_EN);
+	set_wait_for_bits_clear(&mmdc->mprddlhwctl,
+				MPRDDLHWCTL_AUTO_RD_CALIBRATION_EN,
+				MPRDDLHWCTL_AUTO_RD_CALIBRATION_EN);
+
+	out_be32(&mmdc->mdscr,  MDSCR_ENABLE_CON_REQ | CMD_LOAD_MODE_REG |
+				CMD_BANK_ADDR_3);
+
+	/* 10. configure power-down, self-refresh entry, exit parameters */
+	out_be32(&mmdc->mdpdc, CONFIG_MMDC_MDPDC);
+	out_be32(&mmdc->mapsr, MMDC_MAPSR_PWR_SAV_CTRL_STAT);
+
+	/* 11. ZQ config again? do nothing here */
+
+	/* 12. refresh scheme */
+	set_wait_for_bits_clear(&mmdc->mdref, CONFIG_MMDC_MDREF,
+				MDREF_START_REFRESH);
+
+	/* 13. disable CON_REQ */
+	out_be32(&mmdc->mdscr, MDSCR_DISABLE_CFG_REQ);
+}