diff mbox series

[RFC,v1,5/9] ram: cadence: add driver for Cadence EDAC

Message ID 20220809125959.217333-6-ralph.siemsen@linaro.org
State Superseded
Headers show
Series Renesas RZ/N1 SoC initial support | expand

Commit Message

Ralph Siemsen Aug. 9, 2022, 12:59 p.m. UTC
Driver for Cadence EDAC DDR controller, as found in the Renesas RZ/N1.
Only basic setup, not using the ECC features.

Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>
---

 drivers/ram/Kconfig             |   1 +
 drivers/ram/Makefile            |   2 +
 drivers/ram/cadence/Kconfig     |  24 ++
 drivers/ram/cadence/Makefile    |   1 +
 drivers/ram/cadence/ddr_async.c | 295 +++++++++++++++++++++++
 drivers/ram/cadence/ddr_ctrl.c  | 414 ++++++++++++++++++++++++++++++++
 drivers/ram/cadence/ddr_ctrl.h  | 172 +++++++++++++
 7 files changed, 909 insertions(+)
 create mode 100644 drivers/ram/cadence/Kconfig
 create mode 100644 drivers/ram/cadence/Makefile
 create mode 100644 drivers/ram/cadence/ddr_async.c
 create mode 100644 drivers/ram/cadence/ddr_ctrl.c
 create mode 100644 drivers/ram/cadence/ddr_ctrl.h
diff mbox series

Patch

diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig
index 86857c0627..ec0ab9ce8a 100644
--- a/drivers/ram/Kconfig
+++ b/drivers/ram/Kconfig
@@ -97,6 +97,7 @@  config IMXRT_SDRAM
 	  This driver is for the sdram memory interface with the SEMC.
 
 source "drivers/ram/aspeed/Kconfig"
+source "drivers/ram/cadence/Kconfig"
 source "drivers/ram/rockchip/Kconfig"
 source "drivers/ram/sifive/Kconfig"
 source "drivers/ram/stm32mp1/Kconfig"
diff --git a/drivers/ram/Makefile b/drivers/ram/Makefile
index 5a39611349..2a015cda48 100644
--- a/drivers/ram/Makefile
+++ b/drivers/ram/Makefile
@@ -22,3 +22,5 @@  obj-$(CONFIG_IMXRT_SDRAM) += imxrt_sdram.o
 obj-$(CONFIG_RAM_SIFIVE) += sifive/
 
 obj-$(CONFIG_ARCH_OCTEON) += octeon/
+
+obj-$(CONFIG_CADENCE_DDR_CTRL) += cadence/
diff --git a/drivers/ram/cadence/Kconfig b/drivers/ram/cadence/Kconfig
new file mode 100644
index 0000000000..864cadfd10
--- /dev/null
+++ b/drivers/ram/cadence/Kconfig
@@ -0,0 +1,24 @@ 
+if RAM || SPL_RAM
+
+config CADENCE_DDR_CTRL
+	bool "Enable Cadence DDR controller"
+	depends on DM
+	help
+	  Enable support for Cadence DDR controller, as found on
+	  the Renesas RZ/N1 SoC. This controller has a large number
+	  of registers which need to be programmed, mostly using values
+	  obtained from Denali SOMA files via a TCL script.
+
+if CADENCE_DDR_CTRL
+
+# TODO: convert this to devicetree option
+config CADENCE_DDR_CTRL_ENABLE_ECC
+	bool "Enable ECC support"
+
+# TODO: conver this to devicetree option
+config CADENCE_DDR_CTRL_8BIT_WIDTH
+	bool "Reduce data width from 16 to 8 bits"
+
+endif
+
+endif
diff --git a/drivers/ram/cadence/Makefile b/drivers/ram/cadence/Makefile
new file mode 100644
index 0000000000..16c7fe8488
--- /dev/null
+++ b/drivers/ram/cadence/Makefile
@@ -0,0 +1 @@ 
+obj-$(CONFIG_CADENCE_DDR_CTRL) += ddr_async.o ddr_ctrl.o
diff --git a/drivers/ram/cadence/ddr_async.c b/drivers/ram/cadence/ddr_async.c
new file mode 100644
index 0000000000..1d6d3bdc79
--- /dev/null
+++ b/drivers/ram/cadence/ddr_async.c
@@ -0,0 +1,295 @@ 
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * RZ/N1 DDR Controller initialisation
+ *
+ * The DDR Controller register values for a specific DDR device, mode and
+ * frequency are generated using a Cadence tool.
+ *
+ * Copyright (C) 2015 Renesas Electronics Europe Ltd
+ */
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <ram.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#include "ddr_ctrl.h"
+
+void clk_rzn1_reset_state(struct clk *clk, int on);
+
+extern u32 ddr_00_87_async[];
+extern u32 ddr_350_374_async[];
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct cadence_ddr_info {
+	struct udevice *dev;
+	void __iomem *ddrc;
+	void __iomem *phy;
+	struct clk clk_ddrc;
+	struct clk hclk_ddrc;
+};
+
+static inline u32 cadence_readl(void __iomem *addr, unsigned int offset)
+{
+	return readl(addr + offset);
+}
+
+static inline void cadence_writel(void __iomem *addr, unsigned int offset,
+				  u32 data)
+{
+	debug("%s: addr = 0x%p, value = 0x%08x\n", __func__, addr + offset, data);
+	writel(data, addr + offset);
+}
+
+#define ddrc_readl(off)		cadence_readl(priv->ddrc, off)
+#define ddrc_writel(val, off)	cadence_writel(priv->ddrc, off, val)
+
+#define phy_readl(off)		cadence_readl(priv->phy, off)
+#define phy_writel(val, off)	cadence_writel(priv->phy, off, val)
+
+#define RZN1_DDR3_SINGLE_BANK 3
+#define RZN1_DDR3_DUAL_BANK 32
+
+#define FUNCCTRL	0x00
+#define  FUNCCTRL_MASKSDLOFS	(0x18 << 16)
+#define  FUNCCTRL_DVDDQ_1_5V	(1 << 8)
+#define  FUNCCTRL_RESET_N	(1 << 0)
+#define DLLCTRL		0x04
+#define  DLLCTRL_ASDLLOCK	(1 << 26)
+#define  DLLCTRL_MFSL_500MHz	(2 << 1)
+#define  DLLCTRL_MDLLSTBY	(1 << 0)
+#define ZQCALCTRL	0x08
+#define  ZQCALCTRL_ZQCALEND	(1 << 30)
+#define  ZQCALCTRL_ZQCALRSTB	(1 << 0)
+#define ZQODTCTRL	0x0c
+#define RDCTRL		0x10
+#define RDTMG		0x14
+#define FIFOINIT	0x18
+#define  FIFOINIT_RDPTINITEXE	(1 << 8)
+#define  FIFOINIT_WRPTINITEXE	(1 << 0)
+#define OUTCTRL		0x1c
+#define  OUTCTRL_ADCMDOE	(1 << 0)
+#define WLCTRL1		0x40
+#define  WLCTRL1_WLSTR		(1 << 24)
+#define DQCALOFS1	0xe8
+
+/* DDR PHY setup */
+void ddr_phy_init(struct cadence_ddr_info *priv, int ddr_type)
+{
+	u32 val;
+
+	/* Disable DDR Controller clock and FlexWAY connection */
+	clk_disable(&priv->hclk_ddrc);
+	clk_disable(&priv->clk_ddrc);
+
+	clk_rzn1_reset_state(&priv->hclk_ddrc, 0);
+	clk_rzn1_reset_state(&priv->clk_ddrc, 0);
+
+	/* Enable DDR Controller clock and FlexWAY connection */
+	clk_enable(&priv->clk_ddrc);
+	clk_enable(&priv->hclk_ddrc);
+
+	/* DDR PHY Soft reset assert */
+	ddrc_writel(FUNCCTRL_MASKSDLOFS | FUNCCTRL_DVDDQ_1_5V, FUNCCTRL);
+
+	clk_rzn1_reset_state(&priv->hclk_ddrc, 1);
+	clk_rzn1_reset_state(&priv->clk_ddrc, 1);
+
+	/* DDR PHY setup */
+	phy_writel(DLLCTRL_MFSL_500MHz | DLLCTRL_MDLLSTBY, DLLCTRL);
+	phy_writel(0x00000182, ZQCALCTRL);
+	if (ddr_type == RZN1_DDR3_DUAL_BANK)
+		phy_writel(0xAB330031, ZQODTCTRL);
+	else if (ddr_type == RZN1_DDR3_SINGLE_BANK)
+		phy_writel(0xAB320051, ZQODTCTRL);
+	else /* DDR2 */
+		phy_writel(0xAB330071, ZQODTCTRL);
+	phy_writel(0xB545B544, RDCTRL);
+	phy_writel(0x000000B0, RDTMG);
+	phy_writel(0x020A0806, OUTCTRL);
+	if (ddr_type == RZN1_DDR3_DUAL_BANK)
+		phy_writel(0x80005556, WLCTRL1);
+	else
+		phy_writel(0x80005C5D, WLCTRL1);
+	phy_writel(0x00000101, FIFOINIT);
+	phy_writel(0x00004545, DQCALOFS1);
+
+	/* Step 9 MDLL reset release */
+	val = phy_readl(DLLCTRL);
+	val &= ~DLLCTRL_MDLLSTBY;
+	phy_writel(val, DLLCTRL);
+
+	/* Step 12 Soft reset release */
+	val = phy_readl(FUNCCTRL);
+	val |= FUNCCTRL_RESET_N;
+	phy_writel(val, FUNCCTRL);
+
+	/* Step 13 FIFO pointer initialize */
+	phy_writel(FIFOINIT_RDPTINITEXE | FIFOINIT_WRPTINITEXE, FIFOINIT);
+
+	/* Step 14 Execute ZQ Calibration */
+	val = phy_readl(ZQCALCTRL);
+	val |= ZQCALCTRL_ZQCALRSTB;
+	phy_writel(val, ZQCALCTRL);
+
+	/* Step 15 Wait for 200us or more, or wait for DFIINITCOMPLETE to be "1" */
+	while (!(phy_readl(DLLCTRL) & DLLCTRL_ASDLLOCK))
+		;
+	while (!(phy_readl(ZQCALCTRL) & ZQCALCTRL_ZQCALEND))
+		;
+
+	/* Step 16 Enable Address and Command output */
+	val = phy_readl(OUTCTRL);
+	val |= OUTCTRL_ADCMDOE;
+	phy_writel(val, OUTCTRL);
+
+	/* Step 17 Wait for 200us or more(from MRESETB=0) */
+	udelay(200);
+}
+
+void ddr_phy_enable_wl(struct cadence_ddr_info *priv)
+{
+	u32 val;
+
+	/* Step 26 (Set Write Leveling) */
+	val = phy_readl(WLCTRL1);
+	val |= WLCTRL1_WLSTR;
+	phy_writel(val, WLCTRL1);
+}
+
+#define RZN1_DDR_BASE                 0x4000D000      /* RZ/N1D only */
+#define RZN1_V_DDR_BASE               0x80000000      /* RZ/N1D only */
+
+void rzn1_ddr3_single_bank(void *ddr_ctrl_base)
+{
+	/* CS0 */
+	cdns_ddr_set_mr1(ddr_ctrl_base, 0,
+			 MR1_ODT_IMPEDANCE_60_OHMS,
+			 MR1_DRIVE_STRENGTH_40_OHMS);
+	cdns_ddr_set_mr2(ddr_ctrl_base, 0,
+			 MR2_DYNAMIC_ODT_OFF,
+			 MR2_SELF_REFRESH_TEMP_EXT);
+
+	/* ODT_WR_MAP_CS0 = 1, ODT_RD_MAP_CS0 = 0 */
+	cdns_ddr_set_odt_map(ddr_ctrl_base, 0, 0x0100);
+}
+
+int rzn1_dram_init(struct cadence_ddr_info *priv)
+{
+	u32 ddr_start_addr = 0;
+
+	ddr_phy_init(priv, RZN1_DDR3_SINGLE_BANK);
+
+	/*
+	 * Override DDR PHY Interface (DFI) related settings
+	 * DFI is the internal interface between the DDR controller and the DDR PHY.
+	 * These settings are specific to LCES2 and can't be known by the settings
+	 * provided for each DDR model within the generated include.
+	 */
+	ddr_350_374_async[351 - 350] = 0x001e0000;
+	ddr_350_374_async[352 - 350] = 0x1e680000;
+	ddr_350_374_async[353 - 350] = 0x02000020;
+	ddr_350_374_async[354 - 350] = 0x02000200;
+	ddr_350_374_async[355 - 350] = 0x00000c30;
+	ddr_350_374_async[356 - 350] = 0x00009808;
+	ddr_350_374_async[357 - 350] = 0x020a0706;
+	ddr_350_374_async[372 - 350] = 0x01000000;
+
+#if 0
+	/*
+	 * On ES1.0 devices, the DDR start address that the DDR Controller sees
+	 * is the physical address of the DDR. However, later devices changed it
+	 * to be 0 in order to fix an issue with DDR out-of-range detection.
+	 */
+	if (sysctrl_readl(RZN1_SYSCTRL_REG_VERSION) == 0x10)
+		ddr_start_addr = RZN1_V_DDR_BASE;
+#endif
+
+	/* DDR Controller is always in ASYNC mode */
+	cdns_ddr_ctrl_init((void *)RZN1_DDR_BASE, 1,
+			   ddr_00_87_async, ddr_350_374_async,
+			   ddr_start_addr, CONFIG_SYS_SDRAM_SIZE);
+
+	rzn1_ddr3_single_bank((void *)RZN1_DDR_BASE);
+	cdns_ddr_set_diff_cs_delays((void *)RZN1_DDR_BASE, 2, 7, 2, 2);
+	cdns_ddr_set_same_cs_delays((void *)RZN1_DDR_BASE, 0, 7, 0, 0);
+	cdns_ddr_set_odt_times((void *)RZN1_DDR_BASE, 5, 6, 6, 0, 4);
+	cdns_ddr_ctrl_start((void *)RZN1_DDR_BASE);
+
+	ddr_phy_enable_wl(priv);
+
+	if (IS_ENABLED(CONFIG_CADENCE_DDR_CTRL_ENABLE_ECC)) {
+		/*
+		 * Any read before a write will trigger an ECC un-correctable error,
+		 * causing a data abort. However, this is also true for any read with a
+		 * size less than the AXI bus width. So, the only sensible solution is
+		 * to write to all of DDR now and take the hit...
+		 */
+		memset((void *)RZN1_V_DDR_BASE, 0xff, CONFIG_SYS_SDRAM_SIZE);
+	}
+
+	return 0;
+}
+
+static int cadence_ddr_get_info(struct udevice *udev, struct ram_info *info)
+{
+	info->base = 0;
+	info->size = gd->ram_size;
+
+	return 0;
+}
+
+static struct ram_ops cadence_ddr_ops = {
+	.get_info = cadence_ddr_get_info,
+};
+
+static int cadence_ddr_probe(struct udevice *dev)
+{
+	struct cadence_ddr_info *priv = dev_get_priv(dev);
+	int ret;
+
+	priv->ddrc = dev_remap_addr_name(dev, "ddrc");
+	if (!priv->ddrc) {
+		dev_err(dev, "No reg property for Cadence DDR CTRL\n");
+		return -EINVAL;
+	}
+
+	priv->phy = dev_remap_addr_name(dev, "phy");
+	if (!priv->phy) {
+		dev_err(dev, "No reg property for Cadence DDR PHY\n");
+		return -EINVAL;
+	}
+
+	ret = clk_get_by_name(dev, "clk_ddrc", &priv->clk_ddrc);
+	if (ret) {
+		dev_err(dev, "No clock for Cadence DDR\n");
+		return ret;
+	}
+
+	ret = clk_get_by_name(dev, "hclk_ddrc", &priv->hclk_ddrc);
+	if (ret) {
+		dev_err(dev, "No HCLK for Cadence DDR\n");
+		return ret;
+	}
+
+	rzn1_dram_init(priv);
+
+	return 0;
+}
+
+static const struct udevice_id cadence_ddr_ids[] = {
+	{ .compatible = "cadence,ddr-ctrl" },
+	{ }
+};
+
+U_BOOT_DRIVER(cadence_ddr) = {
+	.name		= "cadence_ddr",
+	.id		= UCLASS_RAM,
+	.of_match	= cadence_ddr_ids,
+	.ops		= &cadence_ddr_ops,
+	.probe		= cadence_ddr_probe,
+	.priv_auto	= sizeof(struct cadence_ddr_info),
+	.flags		= DM_FLAG_PRE_RELOC,
+};
diff --git a/drivers/ram/cadence/ddr_ctrl.c b/drivers/ram/cadence/ddr_ctrl.c
new file mode 100644
index 0000000000..833d5d9197
--- /dev/null
+++ b/drivers/ram/cadence/ddr_ctrl.c
@@ -0,0 +1,414 @@ 
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Cadence DDR Controller
+ *
+ * Copyright (C) 2015 Renesas Electronics Europe Ltd
+ */
+
+/*
+ * The Cadence DDR Controller has a huge number of registers that principally
+ * cover two aspects, DDR specific timing information and AXI bus interfacing.
+ * Cadence's TCL script generates all of the register values for specific
+ * DDR devices operating at a specific frequency. The TCL script uses Denali
+ * SOMA files as inputs. The tool also generates the AXI bus register values as
+ * well, however this driver assumes that users will want to modifiy these to
+ * meet a specific application's needs.
+ * Therefore, this driver is passed two arrays containing register values for
+ * the DDR device specific information, and explicity sets the AXI registers.
+ *
+ * AXI bus interfacing:
+ *  The controller has four AXI slaves connections, and each of these can be
+ * programmed to accept requests from specific AXI masters (using their IDs).
+ * The regions of DDR that can be accessed by each AXI slave can be set such
+ * as to isolate DDR used by one AXI master from another. Further, the maximum
+ * bandwidth allocated to each AXI slave can be set.
+ */
+
+#include <common.h>
+#include <linux/delay.h>
+#include <linux/sizes.h>
+#include <asm/io.h>
+#include "ddr_ctrl.h"
+
+/* avoid warning for real pr_debug in <linux/printk.h> */
+#ifdef pr_debug
+#undef pr_debug
+#endif
+
+#ifdef DEBUG
+	#define pr_debug(fmt, args...)	printf(fmt, ##args)
+	#define pr_debug2(fmt, args...)	printf(fmt, ##args)
+#else
+	#define pr_debug(fmt, args...)
+	#define pr_debug2(fmt, args...)
+#endif
+
+#define DDR_NR_AXI_PORTS		4
+#define DDR_NR_ENTRIES			16
+
+#define DDR_START_REG			(0)		/* DENALI_CTL_00 */
+#define DDR_CS0_MR1_REG			(32 * 4)	/* DENALI_CTL_32 */
+#define DDR_CS0_MR2_REG			(32 * 4 + 2)	/* DENALI_CTL_32 */
+#define DDR_CS1_MR1_REG			(34 * 4 + 2)	/* DENALI_CTL_34 */
+#define DDR_CS1_MR2_REG			(35 * 4)	/* DENALI_CTL_35 */
+#define DDR_ECC_ENABLE_REG		(36 * 4 + 2)	/* DENALI_CTL_36 */
+#define DDR_ECC_DISABLE_W_UC_ERR_REG	(37 * 4 + 2)	/* DENALI_CTL_37 */
+#define DDR_HALF_DATAPATH_REG		(54 * 4)	/* DENALI_CTL_54 */
+#define DDR_INTERRUPT_STATUS		(56 * 4)	/* DENALI_CTL_56 */
+#define DDR_INTERRUPT_ACK		(57 * 4)	/* DENALI_CTL_57 */
+#define DDR_INTERRUPT_MASK		(58 * 4)	/* DENALI_CTL_58 */
+#define DDR_CS0_ODT_MAP_REG		(62 * 4 + 2)	/* DENALI_CTL_62 */
+#define DDR_CS1_ODT_MAP_REG		(63 * 4)	/* DENALI_CTL_63 */
+#define DDR_ODT_TODTL_2CMD		(63 * 4 + 2)	/* DENALI_CTL_63 */
+#define DDR_ODT_TODTH_WR		(63 * 4 + 3)	/* DENALI_CTL_63 */
+#define DDR_ODT_TODTH_RD		(64 * 4 + 0)	/* DENALI_CTL_64 */
+#define DDR_ODT_EN			(64 * 4 + 1)	/* DENALI_CTL_64 */
+#define DDR_ODT_WR_TO_ODTH		(64 * 4 + 2)	/* DENALI_CTL_64 */
+#define DDR_ODT_RD_TO_ODTH		(64 * 4 + 3)	/* DENALI_CTL_64 */
+#define DDR_DIFF_CS_DELAY_REG		(66 * 4)	/* DENALI_CTL_66 */
+#define DDR_SAME_CS_DELAY_REG		(67 * 4)	/* DENALI_CTL_67 */
+#define DDR_RW_PRIORITY_REGS		(87 * 4 + 2)	/* DENALI_CTL_87 */
+#define DDR_RW_FIFO_TYPE_REGS		(88 * 4)	/* DENALI_CTL_88 */
+#define DDR_AXI_PORT_PROT_ENABLE_REG	(90 * 4 + 3)	/* DENALI_CTL_90 */
+#define DDR_ADDR_RANGE_REGS		(91 * 4)	/* DENALI_CTL_91 */
+#define DDR_RANGE_PROT_REGS		(218 * 4 + 2)	/* DENALI_CTL_218 */
+#define DDR_ARB_CMD_Q_THRESHOLD_REG	(346 * 4 + 2)	/* DENALI_CTL_346 */
+#define DDR_AXI_PORT_BANDWIDTH_REG	(346 * 4 + 3)	/* DENALI_CTL_346 */
+#define DDR_OPT_RMODW_REG		(372 * 4 + 3)	/* DENALI_CTL_372 */
+
+static void ddrc_writeb(u8 val, void *p)
+{
+	pr_debug2("DDR: %p = 0x%02x\n", p, val);
+	writeb(val, p);
+}
+
+static void ddrc_writew(u16 val, void *p)
+{
+	pr_debug2("DDR: %p = 0x%04x\n", p, val);
+	writew(val, p);
+}
+
+static void ddrc_writel(u32 val, void *p)
+{
+	pr_debug2("DDR: %p = 0x%08x\n", p, val);
+	writel(val, p);
+}
+
+void cdns_ddr_set_mr1(void *base, int cs, u16 odt_impedance, u16 drive_strength)
+{
+	void *reg;
+	u16 tmp;
+
+	if (cs == 0)
+		reg = (u8 *)base + DDR_CS0_MR1_REG;
+	else
+		reg = (u8 *)base + DDR_CS1_MR1_REG;
+
+	tmp = readw(reg);
+
+	tmp &= ~MODE_REGISTER_MASK;
+	tmp |=  MODE_REGISTER_MR1;
+
+	tmp &= ~MR1_ODT_IMPEDANCE_MASK;
+	tmp |=  odt_impedance;
+
+	tmp &= ~MR1_DRIVE_STRENGTH_MASK;
+	tmp |=  drive_strength;
+
+	writew(tmp, reg);
+}
+
+void cdns_ddr_set_mr2(void *base, int cs, u16 dynamic_odt, u16 self_refresh_temp)
+{
+	void *reg;
+	u16 tmp;
+
+	if (cs == 0)
+		reg = (u8 *)base + DDR_CS0_MR2_REG;
+	else
+		reg = (u8 *)base + DDR_CS1_MR2_REG;
+
+	tmp = readw(reg);
+
+	tmp &= ~MODE_REGISTER_MASK;
+	tmp |=  MODE_REGISTER_MR2;
+
+	tmp &= ~MR2_DYNAMIC_ODT_MASK;
+	tmp |=  dynamic_odt;
+
+	tmp &= ~MR2_SELF_REFRESH_TEMP_MASK;
+	tmp |=  self_refresh_temp;
+
+	writew(tmp, reg);
+}
+
+void cdns_ddr_set_odt_map(void *base, int cs, u16 odt_map)
+{
+	void *reg;
+
+	if (cs == 0)
+		reg = (u8 *)base + DDR_CS0_ODT_MAP_REG;
+	else
+		reg = (u8 *)base + DDR_CS1_ODT_MAP_REG;
+
+	writew(odt_map, reg);
+}
+
+void cdns_ddr_set_odt_times(void *base, u8 TODTL_2CMD, u8 TODTH_WR, u8 TODTH_RD,
+			    u8 WR_TO_ODTH, u8 RD_TO_ODTH)
+{
+	writeb(TODTL_2CMD,	(u8 *)base + DDR_ODT_TODTL_2CMD);
+	writeb(TODTH_WR,	(u8 *)base + DDR_ODT_TODTH_WR);
+	writeb(TODTH_RD,	(u8 *)base + DDR_ODT_TODTH_RD);
+	writeb(1,		(u8 *)base + DDR_ODT_EN);
+	writeb(WR_TO_ODTH,	(u8 *)base + DDR_ODT_WR_TO_ODTH);
+	writeb(RD_TO_ODTH,	(u8 *)base + DDR_ODT_RD_TO_ODTH);
+}
+
+void cdns_ddr_set_same_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w)
+{
+	u32 val = (w2w << 24) | (w2r << 16) | (r2w << 8) | r2r;
+
+	writel(val, (u8 *)base + DDR_SAME_CS_DELAY_REG);
+}
+
+void cdns_ddr_set_diff_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w)
+{
+	u32 val = (w2w << 24) | (w2r << 16) | (r2w << 8) | r2r;
+
+	writel(val, (u8 *)base + DDR_DIFF_CS_DELAY_REG);
+}
+
+void cdns_ddr_set_port_rw_priority(void *base, int port,
+				   u8 read_pri, u8 write_pri)
+{
+	u8 *reg8 = (u8 *)base + DDR_RW_PRIORITY_REGS;
+
+	reg8 += (port * 3);
+	pr_debug("%s port %d (reg8=%p, DENALI_CTL_%d)\n",
+		 __func__, port, reg8, (reg8 - (u8 *)base) / 4);
+
+	ddrc_writeb(read_pri, reg8++);
+	ddrc_writeb(write_pri, reg8++);
+}
+
+/* The DDR Controller has 16 entries. Each entry can specify an allowed address
+ * range (with 16KB resolution) for one of the 4 AXI slave ports.
+ */
+void cdns_ddr_enable_port_addr_range(void *base, int port, int entry,
+				     u32 addr_start, u32 size)
+{
+	u32 addr_end;
+	u32 *reg32 = (u32 *)((u8 *)base + DDR_ADDR_RANGE_REGS);
+	u32 tmp;
+
+	reg32 += (port * DDR_NR_ENTRIES * 2);
+	reg32 += (entry * 2);
+	pr_debug("%s port %d, entry %d (reg32=%p, DENALI_CTL_%d)\n",
+		 __func__, port, entry, reg32, ((u8 *)reg32 - (u8 *)base) / 4);
+
+	/* These registers represent 16KB address blocks */
+	addr_start /= SZ_16K;
+	size /= SZ_16K;
+	if (size)
+		addr_end = addr_start + size - 1;
+	else
+		addr_end = addr_start;
+
+	ddrc_writel(addr_start, reg32++);
+
+	/*
+	 * end_addr: Ensure we only set the bottom 18-bits as DENALI_CTL_218
+	 * also contains the AXI0 range protection bits.
+	 */
+	tmp = readl(reg32);
+	tmp &= ~(BIT(18) - 1);
+	tmp |= addr_end;
+	ddrc_writel(tmp, reg32);
+}
+
+void cdns_ddr_enable_addr_range(void *base, int entry,
+				u32 addr_start, u32 size)
+{
+	int axi;
+
+	for (axi = 0; axi < DDR_NR_AXI_PORTS; axi++)
+		cdns_ddr_enable_port_addr_range(base, axi, entry,
+						addr_start, size);
+}
+
+void cdns_ddr_enable_port_prot(void *base, int port, int entry,
+			       enum cdns_ddr_range_prot range_protection_bits,
+			       u16 range_RID_check_bits,
+			       u16 range_WID_check_bits,
+			       u8 range_RID_check_bits_ID_lookup,
+			       u8 range_WID_check_bits_ID_lookup)
+{
+	/*
+	 * Technically, the offset here points to the byte before the start of
+	 * the range protection registers. However, all entries consist of 8
+	 * bytes, except the first one (which is missing a padding byte) so we
+	 * work around that subtlely.
+	 */
+	u8 *reg8 = (u8 *)base + DDR_RANGE_PROT_REGS;
+
+	reg8 += (port * DDR_NR_ENTRIES * 8);
+	reg8 += (entry * 8);
+	pr_debug("%s port %d, entry %d (reg8=%p, DENALI_CTL_%d)\n",
+		 __func__, port, entry, reg8, (reg8 - (u8 *)base) / 4);
+
+	if (port == 0 && entry == 0)
+		ddrc_writeb(range_protection_bits, reg8 + 1);
+	else
+		ddrc_writeb(range_protection_bits, reg8);
+
+	ddrc_writew(range_RID_check_bits, reg8 + 2);
+	ddrc_writew(range_WID_check_bits, reg8 + 4);
+	ddrc_writeb(range_RID_check_bits_ID_lookup, reg8 + 6);
+	ddrc_writeb(range_WID_check_bits_ID_lookup, reg8 + 7);
+}
+
+void cdns_ddr_enable_prot(void *base, int entry,
+			  enum cdns_ddr_range_prot range_protection_bits,
+			  u16 range_RID_check_bits,
+			  u16 range_WID_check_bits,
+			  u8 range_RID_check_bits_ID_lookup,
+			  u8 range_WID_check_bits_ID_lookup)
+{
+	int axi;
+
+	for (axi = 0; axi < DDR_NR_AXI_PORTS; axi++)
+		cdns_ddr_enable_port_prot(base, axi, entry,
+					  range_protection_bits,
+					  range_RID_check_bits,
+					  range_WID_check_bits,
+					  range_RID_check_bits_ID_lookup,
+					  range_WID_check_bits_ID_lookup);
+}
+
+void cdns_ddr_set_port_bandwidth(void *base, int port,
+				 u8 max_percent, u8 overflow_ok)
+{
+	u8 *reg8 = (u8 *)base + DDR_AXI_PORT_BANDWIDTH_REG;
+
+	reg8 += (port * 3);
+	pr_debug("%s port %d, (reg8=%p, DENALI_CTL_%d)\n",
+		 __func__, port, reg8, (reg8 - (u8 *)base) / 4);
+
+	ddrc_writeb(max_percent, reg8++);	/* Maximum bandwidth percentage */
+	ddrc_writeb(overflow_ok, reg8++);	/* Bandwidth overflow allowed */
+}
+
+void cdns_ddr_ctrl_init(void *ddr_ctrl_basex, int async,
+			const u32 *reg0, const u32 *reg350,
+			u32 ddr_start_addr, u32 ddr_size)
+{
+	int i, axi, entry;
+	u32 *ddr_ctrl_base = (u32 *)ddr_ctrl_basex;
+	u8 *base8 = (u8 *)ddr_ctrl_basex;
+
+	pr_debug("%s\n", __func__);
+	ddrc_writel(*reg0, ddr_ctrl_base + 0);
+	/* 1 to 6 are read only */
+	for (i = 7; i <= 26; i++)
+		ddrc_writel(*(reg0 + i), ddr_ctrl_base + i);
+	/* 27 to 29 are not changed */
+	for (i = 30; i <= 87; i++)
+		ddrc_writel(*(reg0 + i), ddr_ctrl_base + i);
+
+	/* Enable/disable ECC */
+	if (IS_ENABLED(CONFIG_CADENCE_DDR_CTRL_ENABLE_ECC)) {
+		pr_debug("%s enabling ECC\n", __func__);
+		ddrc_writeb(1, base8 + DDR_ECC_ENABLE_REG);
+	} else {
+		ddrc_writeb(0, base8 + DDR_ECC_ENABLE_REG);
+	}
+
+	/* ECC: Disable corruption for read/modify/write operations */
+	ddrc_writeb(1, base8 + DDR_ECC_DISABLE_W_UC_ERR_REG);
+
+	/* Set 8/16-bit data width using reduc bit (enable half datapath)*/
+	if (IS_ENABLED(CONFIG_CADENCE_DDR_CTRL_8BIT_WIDTH)) {
+		pr_debug("%s using 8-bit data\n", __func__);
+		ddrc_writeb(1, base8 + DDR_HALF_DATAPATH_REG);
+	} else {
+		ddrc_writeb(0, base8 + DDR_HALF_DATAPATH_REG);
+	}
+
+	/* Threshold for command queue */
+	ddrc_writeb(4, base8 + DDR_ARB_CMD_Q_THRESHOLD_REG);
+
+	/* AXI port protection => enable */
+	ddrc_writeb(0x01, base8 + DDR_AXI_PORT_PROT_ENABLE_REG);
+
+	/* Set port interface type, default port priority and bandwidths */
+	for (axi = 0; axi < DDR_NR_AXI_PORTS; axi++) {
+		/* port interface type: synchronous or asynchronous AXI clock */
+		u8 *fifo_reg = base8 + DDR_RW_FIFO_TYPE_REGS + (axi * 3);
+
+		if (async)
+			ddrc_writeb(0, fifo_reg);
+		else
+			ddrc_writeb(3, fifo_reg);
+
+		/* R/W priorities */
+		cdns_ddr_set_port_rw_priority(ddr_ctrl_base, axi, 2, 2);
+
+		/* AXI bandwidth */
+		cdns_ddr_set_port_bandwidth(ddr_ctrl_base, axi, 50, 1);
+	}
+
+	/*
+	 * The hardware requires that the valid address ranges must not overlap.
+	 * So, we initialise all address ranges to be above the DDR, length 0.
+	 */
+	for (entry = 0; entry < DDR_NR_ENTRIES; entry++)
+		cdns_ddr_enable_addr_range(ddr_ctrl_base, entry,
+					   ddr_start_addr + ddr_size, 0);
+
+	for (i = 350; i <= 374; i++)
+		ddrc_writel(*(reg350 - 350 + i), ddr_ctrl_base + i);
+
+	/* Disable optimised read-modify-write logic */
+	ddrc_writeb(0, base8 + DDR_OPT_RMODW_REG);
+
+	/*
+	 * Disable all interrupts, we are not handling them.
+	 * For detail of the interrupt mask, ack and status bits, see the
+	 * manual's description of the 'int_status' parameter.
+	 */
+	ddrc_writel(0, base8 + DDR_INTERRUPT_MASK);
+
+	/*
+	 * Default settings to enable full access to the entire DDR.
+	 * Users can set different ranges and access rights by calling these
+	 * functions before calling cdns_ddr_ctrl_start().
+	 */
+	cdns_ddr_enable_addr_range(ddr_ctrl_base, 0,
+				   ddr_start_addr, ddr_size);
+	cdns_ddr_enable_prot(ddr_ctrl_base, 0, CDNS_DDR_RANGE_PROT_BITS_FULL,
+			     0xffff, 0xffff, 0x0f, 0x0f);
+}
+
+void cdns_ddr_ctrl_start(void *ddr_ctrl_basex)
+{
+	u32 *ddr_ctrl_base = (u32 *)ddr_ctrl_basex;
+	u8 *base8 = (u8 *)ddr_ctrl_basex;
+
+	/* Start */
+	ddrc_writeb(1, base8 + DDR_START_REG);
+
+	/* Wait for controller to be ready (interrupt status) */
+	while (!(readl(base8 + DDR_INTERRUPT_STATUS) & 0x100))
+		;
+
+	/* clear all interrupts */
+	ddrc_writel(~0, base8 + DDR_INTERRUPT_ACK);
+
+	/* Step 19 Wait 500us from MRESETB=1 */
+	udelay(500);
+
+	/* Step 20 tCKSRX wait (From supply stable clock for MCK) */
+	/* DENALI_CTL_19 TREF_ENABLE=0x1(=1), AREFRESH=0x1(=1) */
+	ddrc_writel(0x01000100, ddr_ctrl_base + 19);
+}
diff --git a/drivers/ram/cadence/ddr_ctrl.h b/drivers/ram/cadence/ddr_ctrl.h
new file mode 100644
index 0000000000..638d986261
--- /dev/null
+++ b/drivers/ram/cadence/ddr_ctrl.h
@@ -0,0 +1,172 @@ 
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Cadence DDR Controller
+ *
+ * Copyright (C) 2015 Renesas Electronics Europe Ltd
+ */
+
+#ifndef CADENCE_DDR_CTRL_H
+#define CADENCE_DDR_CTRL_H
+
+enum cdns_ddr_range_prot {
+	CDNS_DDR_RANGE_PROT_BITS_PRIV_SECURE = 0,
+	CDNS_DDR_RANGE_PROT_BITS_SECURE = 1,
+	CDNS_DDR_RANGE_PROT_BITS_PRIV = 2,
+	CDNS_DDR_RANGE_PROT_BITS_FULL = 3,
+};
+
+/**
+ * Initialise the Cadence DDR Controller, but doesn't start it.
+ *
+ * It sets up the controller so that all 4 AXI slave ports allow access to all
+ * of the DDR with the same settings. This means that:
+ *  - Full access permisions.
+ *  - All read/write priorities are set to 2.
+ *  - Bandwidth is set to 50%, overflow is allowed, i.e. it's a soft limit.
+ * If you want different properties for different ports and/or addr ranges, call
+ * the other functions before calling cdns_ddr_ctrl_start().
+ *
+ * @ddr_ctrl_base  Physical address of the DDR Controller.
+ * @async          0 if DDR clock is synchronous with the controller clock
+ *                 otherwise 1.
+ * @reg0           Pointer to array of 32-bit values to be written to registers
+ *                 0 to 87. The values are generated by Cadence TCL scripts.
+ * @reg350         Pointer to array of 32-bit values to be written to registers
+ *                 350 to 374. The values are generated by Cadence TCL scripts.
+ * @ddr_start_addr Physical address of the start of DDR.
+ * @ddr_size       Size of the DDR in bytes. The controller will set the port
+ *                 protection range to match this size.
+ */
+void cdns_ddr_ctrl_init(void *ddr_ctrl_base, int async,
+			const u32 *reg0, const u32 *reg350,
+			u32 ddr_start_addr, u32 ddr_size);
+
+/**
+ * Start the Cadence DDR Controller.
+ *
+ * @ddr_ctrl_base  Physical address of the DDR Controller.
+ */
+void cdns_ddr_ctrl_start(void *ddr_ctrl_base);
+
+/**
+ * Set the priority for read and write operations for a specific AXI slave port.
+ *
+ * @base      Physical address of the DDR Controller.
+ * @port      Port number. Range is 0 to 3.
+ * @read_pri  Priority for reads.  Range is 0 to 3, where 0 is highest priority.
+ * @write_pri Priority for writes. Range is 0 to 3, where 0 is highest priority.
+ */
+void cdns_ddr_set_port_rw_priority(void *base, int port,
+				   u8 read_pri, u8 write_pri);
+
+/**
+ * Specify address range for a protection entry, for a specific AXI slave port.
+ *
+ * @base       Physical address of the DDR Controller.
+ * @port       Port number. Range is 0 to 3.
+ * @entry      The protection entry. Range is 0 to 15.
+ * @start_addr Physical of the address range, must be aligned to 16KB.
+ * @size       Size of the address range, must be multiple of 16KB.
+ */
+void cdns_ddr_enable_port_addr_range(void *base, int port, int entry,
+				     u32 addr_start, u32 size);
+
+/**
+ * Specify address range for a protection entry, for all AXI slave ports.
+ *
+ * @base       Physical address of the DDR Controller.
+ * @entry      The protection entry. Range is 0 to 15.
+ * @start_addr Physical of the address range, must be aligned to 16KB.
+ * @size       Size of the address range, must be multiple of 16KB.
+ */
+void cdns_ddr_enable_addr_range(void *base, int entry,
+				u32 addr_start, u32 size);
+
+/**
+ * Specify protection entry details, for a specific AXI slave port.
+ *
+ * See the hardware manual for details of the range check bits.
+ *
+ * @base       Physical address of the DDR Controller.
+ * @port       Port number. Range is 0 to 3.
+ * @entry      The protection entry. Range is 0 to 15.
+ */
+void cdns_ddr_enable_port_prot(void *base, int port, int entry,
+			       enum cdns_ddr_range_prot range_protection_bits,
+			       u16 range_RID_check_bits,
+			       u16 range_WID_check_bits,
+			       u8 range_RID_check_bits_ID_lookup,
+			       u8 range_WID_check_bits_ID_lookup);
+
+/**
+ * Specify protection entry details, for all AXI slave ports.
+ *
+ * See the hardware manual for details of the range check bits.
+ *
+ * @base       Physical address of the DDR Controller.
+ * @entry      The protection entry. Range is 0 to 15.
+ */
+void cdns_ddr_enable_prot(void *base, int entry,
+			  enum cdns_ddr_range_prot range_protection_bits,
+			  u16 range_RID_check_bits,
+			  u16 range_WID_check_bits,
+			  u8 range_RID_check_bits_ID_lookup,
+			  u8 range_WID_check_bits_ID_lookup);
+
+/**
+ * Specify bandwidth for each AXI port.
+ *
+ * See the hardware manual for details of the range check bits.
+ *
+ * @base       Physical address of the DDR Controller.
+ * @port       Port number. Range is 0 to 3.
+ * @max_percent     0 to 100.
+ */
+void cdns_ddr_set_port_bandwidth(void *base, int port,
+				 u8 max_percent, u8 overflow_ok);
+
+/* Standard JEDEC registers */
+#define MODE_REGISTER_MASK		(3 << 14)
+#define MODE_REGISTER_MR0		(0 << 14)
+#define MODE_REGISTER_MR1		(1 << 14)
+#define MODE_REGISTER_MR2		(2 << 14)
+#define MODE_REGISTER_MR3		(3 << 14)
+#define MR1_DRIVE_STRENGTH_MASK		((1 << 5) | (1 << 1))
+#define MR1_DRIVE_STRENGTH_34_OHMS	((0 << 5) | (1 << 1))
+#define MR1_DRIVE_STRENGTH_40_OHMS	((0 << 5) | (0 << 1))
+#define MR1_ODT_IMPEDANCE_MASK		((1 << 9) | (1 << 6) | (1 << 2))
+#define MR1_ODT_IMPEDANCE_60_OHMS	((0 << 9) | (0 << 6) | (1 << 2))
+#define MR1_ODT_IMPEDANCE_120_OHMS	((0 << 9) | (1 << 6) | (0 << 2))
+#define MR1_ODT_IMPEDANCE_40_OHMS	((0 << 9) | (1 << 6) | (1 << 2))
+#define MR1_ODT_IMPEDANCE_20_OHMS	((1 << 9) | (0 << 6) | (0 << 2))
+#define MR1_ODT_IMPEDANCE_30_OHMS	((1 << 9) | (0 << 6) | (1 << 2))
+#define MR2_DYNAMIC_ODT_MASK		(3 << 9)
+#define MR2_DYNAMIC_ODT_OFF		(0 << 9)
+#define MR2_SELF_REFRESH_TEMP_MASK	(1 << 7)
+#define MR2_SELF_REFRESH_TEMP_EXT	(1 << 7)
+
+/**
+ * Set certain fields of the JEDEC MR1 register.
+ */
+void cdns_ddr_set_mr1(void *base, int cs, u16 odt_impedance, u16 drive_strength);
+
+/**
+ * Set certain fields of the JEDEC MR2 register.
+ */
+void cdns_ddr_set_mr2(void *base, int cs, u16 dynamic_odt, u16 self_refresh_temp);
+
+/**
+ * Set ODT map of the DDR Controller.
+ */
+void cdns_ddr_set_odt_map(void *base, int cs, u16 odt_map);
+
+/**
+ * Set ODT settings in the DDR Controller.
+ */
+void cdns_ddr_set_odt_times(void *base, u8 TODTL_2CMD, u8 TODTH_WR, u8 TODTH_RD,
+			    u8 WR_TO_ODTH, u8 RD_TO_ODTH);
+
+void cdns_ddr_set_same_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w);
+void cdns_ddr_set_diff_cs_delays(void *base, u8 r2r, u8 r2w, u8 w2r, u8 w2w);
+
+#endif