drivers/ram/renesas/rzn1/ddr_async.c - filogic/uboot - Gitiles

 // 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 <clk.h>
 #include <dm.h>
 #include <dm/device_compat.h>
 #include <ram.h>
 #include <regmap.h>
 #include <syscon.h>
 #include <asm/io.h>
 #include <linux/delay.h>
 #include <wait_bit.h>
 #include <renesas/ddr_ctrl.h>

 void clk_rzn1_reset_state(struct clk *clk, int on);

 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;
 	struct regmap *syscon;
 	bool enable_ecc;
 	bool enable_8bit;
 	u32 ddr_size;

 	/* These two used only during .probe */
 	u32 *reg0;
 	u32 *reg350;
 };

 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	BIT(8)
 #define  FUNCCTRL_RESET_N	BIT(0)
 #define DLLCTRL		0x04
 #define  DLLCTRL_ASDLLOCK	BIT(26)
 #define  DLLCTRL_MFSL_500MHz	(2 << 1)
 #define  DLLCTRL_MDLLSTBY	BIT(0)
 #define ZQCALCTRL	0x08
 #define  ZQCALCTRL_ZQCALEND	BIT(30)
 #define  ZQCALCTRL_ZQCALRSTB	BIT(0)
 #define ZQODTCTRL	0x0c
 #define RDCTRL		0x10
 #define RDTMG		0x14
 #define FIFOINIT	0x18
 #define  FIFOINIT_RDPTINITEXE	BIT(8)
 #define  FIFOINIT_WRPTINITEXE	BIT(0)
 #define OUTCTRL		0x1c
 #define  OUTCTRL_ADCMDOE	BIT(0)
 #define WLCTRL1		0x40
 #define  WLCTRL1_WLSTR		BIT(24)
 #define DQCALOFS1	0xe8

 /* DDR PHY setup */
 static 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" */
 	wait_for_bit_le32(priv->phy + DLLCTRL, DLLCTRL_ASDLLOCK, true, 1, false);
 	wait_for_bit_le32(priv->phy + ZQCALCTRL, ZQCALCTRL_ZQCALEND, true, 1, false);

 	/* 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);
 }

 static 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_V_DDR_BASE               0x80000000      /* RZ/N1D only */

 static 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);
 }

 static int rzn1_dram_init(struct cadence_ddr_info *priv)
 {
 	u32 version;
 	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 the board and can't be known by the settings
 	 * provided for each DDR model within the generated include.
 	 */
 	priv->reg350[351 - 350] = 0x001e0000;
 	priv->reg350[352 - 350] = 0x1e680000;
 	priv->reg350[353 - 350] = 0x02000020;
 	priv->reg350[354 - 350] = 0x02000200;
 	priv->reg350[355 - 350] = 0x00000c30;
 	priv->reg350[356 - 350] = 0x00009808;
 	priv->reg350[357 - 350] = 0x020a0706;
 	priv->reg350[372 - 350] = 0x01000000;

 	/*
 	 * 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.
 	 */
 #define RZN1_SYSCTRL_REG_VERSION 412
 	regmap_read(priv->syscon, RZN1_SYSCTRL_REG_VERSION, &version);
 	if (version == 0x10)
 		ddr_start_addr = RZN1_V_DDR_BASE;

 	if (priv->enable_ecc)
 		priv->ddr_size = priv->ddr_size / 2;

 	/* DDR Controller is always in ASYNC mode */
 	cdns_ddr_ctrl_init(priv->ddrc, 1,
 			   priv->reg0, priv->reg350,
 			   ddr_start_addr, priv->ddr_size,
 			   priv->enable_ecc, priv->enable_8bit);

 	rzn1_ddr3_single_bank(priv->ddrc);
 	cdns_ddr_set_diff_cs_delays(priv->ddrc, 2, 7, 2, 2);
 	cdns_ddr_set_same_cs_delays(priv->ddrc, 0, 7, 0, 0);
 	cdns_ddr_set_odt_times(priv->ddrc, 5, 6, 6, 0, 4);
 	cdns_ddr_ctrl_start(priv->ddrc);

 	ddr_phy_enable_wl(priv);

 	if (priv->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, priv->ddr_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_test(long *base, long maxsize)
 {
 	volatile long *addr = base;
 	long           cnt;

 	maxsize /= sizeof(long);

 	for (cnt = 1; cnt <= maxsize; cnt <<= 1) {
 		addr[cnt - 1] = ~cnt;
 	}

 	for (cnt = 1; cnt <= maxsize; cnt <<= 1) {
 		if (addr[cnt - 1] != ~cnt) {
 			return 0;
 		}
 	}

 	return 1;
 }

 static int cadence_ddr_probe(struct udevice *dev)
 {
 	struct cadence_ddr_info *priv = dev_get_priv(dev);
 	ofnode subnode;
 	int ret;

 	priv->dev = dev;

 	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;
 	}

 	priv->syscon = syscon_regmap_lookup_by_phandle(dev, "syscon");
 	if (IS_ERR(priv->syscon)) {
 		dev_err(dev, "No syscon node found\n");
 		return PTR_ERR(priv->syscon);
 	}

 	priv->enable_ecc = dev_read_bool(dev, "enable-ecc");
 	priv->enable_8bit = dev_read_bool(dev, "enable-8bit");

 	priv->reg0 = malloc(88 * sizeof(u32));
 	priv->reg350 = malloc(25 * sizeof(u32));
 	if (!priv->reg0 || !priv->reg350)
 		panic("malloc failure\n");

 	/* There may be multiple DDR configurations to try */
 	dev_for_each_subnode(subnode, dev) {
 		ret = ofnode_read_u32(subnode, "size", &priv->ddr_size);
 		if (ret) {
 			dev_err(dev, "No size for Cadence DDR\n");
 			continue;
 		}

 		ret = ofnode_read_u32_array(subnode, "cadence,ctl-000", priv->reg0, 88);
 		if (ret) {
 			dev_err(dev, "No cadence,ctl-000\n");
 			continue;
 		}

 		ret = ofnode_read_u32_array(subnode, "cadence,ctl-350", priv->reg350, 25);
 		if (ret) {
 			dev_err(dev, "No cadence,ctl-350\n");
 			continue;
 		}

 		if (rzn1_dram_init(priv))
 			continue;

 		if (cadence_ddr_test((long *)RZN1_V_DDR_BASE, priv->ddr_size)) {
 			gd->ram_base = RZN1_V_DDR_BASE;
 			gd->ram_size = priv->ddr_size;
 			break;
 		}
 	}

 	if (!priv->ddr_size)
 		panic("No valid DDR to start");

 	free(priv->reg350);
 	free(priv->reg0);

 	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,
 };
	// 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 <clk.h>
	#include <dm.h>
	#include <dm/device_compat.h>
	#include <ram.h>
	#include <regmap.h>
	#include <syscon.h>
	#include <asm/io.h>
	#include <linux/delay.h>
	#include <wait_bit.h>
	#include <renesas/ddr_ctrl.h>

	void clk_rzn1_reset_state(struct clk *clk, int on);

	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;
	struct regmap *syscon;
	bool enable_ecc;
	bool enable_8bit;
	u32 ddr_size;

	/* These two used only during .probe */
	u32 *reg0;
	u32 *reg350;
	};

	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 BIT(8)
	#define FUNCCTRL_RESET_N BIT(0)
	#define DLLCTRL 0x04
	#define DLLCTRL_ASDLLOCK BIT(26)
	#define DLLCTRL_MFSL_500MHz (2 << 1)
	#define DLLCTRL_MDLLSTBY BIT(0)
	#define ZQCALCTRL 0x08
	#define ZQCALCTRL_ZQCALEND BIT(30)
	#define ZQCALCTRL_ZQCALRSTB BIT(0)
	#define ZQODTCTRL 0x0c
	#define RDCTRL 0x10
	#define RDTMG 0x14
	#define FIFOINIT 0x18
	#define FIFOINIT_RDPTINITEXE BIT(8)
	#define FIFOINIT_WRPTINITEXE BIT(0)
	#define OUTCTRL 0x1c
	#define OUTCTRL_ADCMDOE BIT(0)
	#define WLCTRL1 0x40
	#define WLCTRL1_WLSTR BIT(24)
	#define DQCALOFS1 0xe8

	/* DDR PHY setup */
	static 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" */
	wait_for_bit_le32(priv->phy + DLLCTRL, DLLCTRL_ASDLLOCK, true, 1, false);
	wait_for_bit_le32(priv->phy + ZQCALCTRL, ZQCALCTRL_ZQCALEND, true, 1, false);

	/* 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);
	}

	static 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_V_DDR_BASE 0x80000000 /* RZ/N1D only */

	static 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);
	}

	static int rzn1_dram_init(struct cadence_ddr_info *priv)
	{
	u32 version;
	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 the board and can't be known by the settings
	* provided for each DDR model within the generated include.
	*/
	priv->reg350[351 - 350] = 0x001e0000;
	priv->reg350[352 - 350] = 0x1e680000;
	priv->reg350[353 - 350] = 0x02000020;
	priv->reg350[354 - 350] = 0x02000200;
	priv->reg350[355 - 350] = 0x00000c30;
	priv->reg350[356 - 350] = 0x00009808;
	priv->reg350[357 - 350] = 0x020a0706;
	priv->reg350[372 - 350] = 0x01000000;

	/*
	* 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.
	*/
	#define RZN1_SYSCTRL_REG_VERSION 412
	regmap_read(priv->syscon, RZN1_SYSCTRL_REG_VERSION, &version);
	if (version == 0x10)
	ddr_start_addr = RZN1_V_DDR_BASE;

	if (priv->enable_ecc)
	priv->ddr_size = priv->ddr_size / 2;

	/* DDR Controller is always in ASYNC mode */
	cdns_ddr_ctrl_init(priv->ddrc, 1,
	priv->reg0, priv->reg350,
	ddr_start_addr, priv->ddr_size,
	priv->enable_ecc, priv->enable_8bit);

	rzn1_ddr3_single_bank(priv->ddrc);
	cdns_ddr_set_diff_cs_delays(priv->ddrc, 2, 7, 2, 2);
	cdns_ddr_set_same_cs_delays(priv->ddrc, 0, 7, 0, 0);
	cdns_ddr_set_odt_times(priv->ddrc, 5, 6, 6, 0, 4);
	cdns_ddr_ctrl_start(priv->ddrc);

	ddr_phy_enable_wl(priv);

	if (priv->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, priv->ddr_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_test(long *base, long maxsize)
	{
	volatile long *addr = base;
	long cnt;

	maxsize /= sizeof(long);

	for (cnt = 1; cnt <= maxsize; cnt <<= 1) {
	addr[cnt - 1] = ~cnt;
	}

	for (cnt = 1; cnt <= maxsize; cnt <<= 1) {
	if (addr[cnt - 1] != ~cnt) {
	return 0;
	}
	}

	return 1;
	}

	static int cadence_ddr_probe(struct udevice *dev)
	{
	struct cadence_ddr_info *priv = dev_get_priv(dev);
	ofnode subnode;
	int ret;

	priv->dev = dev;

	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;
	}

	priv->syscon = syscon_regmap_lookup_by_phandle(dev, "syscon");
	if (IS_ERR(priv->syscon)) {
	dev_err(dev, "No syscon node found\n");
	return PTR_ERR(priv->syscon);
	}

	priv->enable_ecc = dev_read_bool(dev, "enable-ecc");
	priv->enable_8bit = dev_read_bool(dev, "enable-8bit");

	priv->reg0 = malloc(88 * sizeof(u32));
	priv->reg350 = malloc(25 * sizeof(u32));
	if (!priv->reg0 \|\| !priv->reg350)
	panic("malloc failure\n");

	/* There may be multiple DDR configurations to try */
	dev_for_each_subnode(subnode, dev) {
	ret = ofnode_read_u32(subnode, "size", &priv->ddr_size);
	if (ret) {
	dev_err(dev, "No size for Cadence DDR\n");
	continue;
	}

	ret = ofnode_read_u32_array(subnode, "cadence,ctl-000", priv->reg0, 88);
	if (ret) {
	dev_err(dev, "No cadence,ctl-000\n");
	continue;
	}

	ret = ofnode_read_u32_array(subnode, "cadence,ctl-350", priv->reg350, 25);
	if (ret) {
	dev_err(dev, "No cadence,ctl-350\n");
	continue;
	}

	if (rzn1_dram_init(priv))
	continue;

	if (cadence_ddr_test((long *)RZN1_V_DDR_BASE, priv->ddr_size)) {
	gd->ram_base = RZN1_V_DDR_BASE;
	gd->ram_size = priv->ddr_size;
	break;
	}
	}

	if (!priv->ddr_size)
	panic("No valid DDR to start");

	free(priv->reg350);
	free(priv->reg0);

	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,
	};