drivers/ram/sifive/sifive_ddr.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
 /*
  * (C) Copyright 2020-2021 SiFive, Inc.
  *
  * Authors:
  *   Pragnesh Patel <pragnesh.patel@sifive.com>
  */

 #include <common.h>
 #include <dm.h>
 #include <fdtdec.h>
 #include <init.h>
 #include <ram.h>
 #include <syscon.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <clk.h>
 #include <wait_bit.h>
 #include <linux/bitops.h>

 #define DENALI_CTL_0	0
 #define DENALI_CTL_21	21
 #define DENALI_CTL_120	120
 #define DENALI_CTL_132	132
 #define DENALI_CTL_136	136
 #define DENALI_CTL_170	170
 #define DENALI_CTL_181	181
 #define DENALI_CTL_182	182
 #define DENALI_CTL_184	184
 #define DENALI_CTL_208	208
 #define DENALI_CTL_209	209
 #define DENALI_CTL_210	210
 #define DENALI_CTL_212	212
 #define DENALI_CTL_214	214
 #define DENALI_CTL_216	216
 #define DENALI_CTL_224	224
 #define DENALI_CTL_225	225
 #define DENALI_CTL_260	260

 #define DENALI_PHY_1152	1152
 #define DENALI_PHY_1214	1214

 #define DRAM_CLASS_OFFSET			8
 #define DRAM_CLASS_DDR4				0xA
 #define OPTIMAL_RMODW_EN_OFFSET			0
 #define DISABLE_RD_INTERLEAVE_OFFSET		16
 #define OUT_OF_RANGE_OFFSET			1
 #define MULTIPLE_OUT_OF_RANGE_OFFSET		2
 #define PORT_COMMAND_CHANNEL_ERROR_OFFSET	7
 #define MC_INIT_COMPLETE_OFFSET			8
 #define LEVELING_OPERATION_COMPLETED_OFFSET	22
 #define DFI_PHY_WRLELV_MODE_OFFSET		24
 #define DFI_PHY_RDLVL_MODE_OFFSET		24
 #define DFI_PHY_RDLVL_GATE_MODE_OFFSET		0
 #define VREF_EN_OFFSET				24
 #define PORT_ADDR_PROTECTION_EN_OFFSET		0
 #define AXI0_ADDRESS_RANGE_ENABLE		8
 #define AXI0_RANGE_PROT_BITS_0_OFFSET		24
 #define RDLVL_EN_OFFSET				16
 #define RDLVL_GATE_EN_OFFSET			24
 #define WRLVL_EN_OFFSET				0

 #define PHY_RX_CAL_DQ0_0_OFFSET			0
 #define PHY_RX_CAL_DQ1_0_OFFSET			16

 DECLARE_GLOBAL_DATA_PTR;

 struct sifive_ddrctl {
 	volatile u32 denali_ctl[265];
 };

 struct sifive_ddrphy {
 	volatile u32 denali_phy[1215];
 };

 /**
  * struct sifive_ddr_info
  *
  * @dev                         : pointer for the device
  * @info                        : UCLASS RAM information
  * @ctl                         : DDR controller base address
  * @phy                         : DDR PHY base address
  * @ctrl                        : DDR control base address
  * @physical_filter_ctrl        : DDR physical filter control base address
  */
 struct sifive_ddr_info {
 	struct udevice *dev;
 	struct ram_info info;
 	struct sifive_ddrctl *ctl;
 	struct sifive_ddrphy *phy;
 	struct clk ddr_clk;
 	u32 *physical_filter_ctrl;
 };

 #if defined(CONFIG_SPL_BUILD)
 struct sifive_ddr_params {
 	struct sifive_ddrctl pctl_regs;
 	struct sifive_ddrphy phy_regs;
 };

 struct sifive_dmc_plat {
 	struct sifive_ddr_params ddr_params;
 };

 /*
  * TODO : It can be possible to use common sdram_copy_to_reg() API
  * n: Unit bytes
  */
 static void sdram_copy_to_reg(volatile u32 *dest,
 			      volatile u32 *src, u32 n)
 {
 	int i;

 	for (i = 0; i < n / sizeof(u32); i++) {
 		writel(*src, dest);
 		src++;
 		dest++;
 	}
 }

 static void sifive_ddr_setup_range_protection(volatile u32 *ctl, u64 end_addr)
 {
 	u32 end_addr_16kblocks = ((end_addr >> 14) & 0x7FFFFF) - 1;

 	writel(0x0, DENALI_CTL_209 + ctl);
 	writel(end_addr_16kblocks, DENALI_CTL_210 + ctl);
 	writel(0x0, DENALI_CTL_212 + ctl);
 	writel(0x0, DENALI_CTL_214 + ctl);
 	writel(0x0, DENALI_CTL_216 + ctl);
 	setbits_le32(DENALI_CTL_224 + ctl,
 		     0x3 << AXI0_RANGE_PROT_BITS_0_OFFSET);
 	writel(0xFFFFFFFF, DENALI_CTL_225 + ctl);
 	setbits_le32(DENALI_CTL_208 + ctl, 0x1 << AXI0_ADDRESS_RANGE_ENABLE);
 	setbits_le32(DENALI_CTL_208 + ctl,
 		     0x1 << PORT_ADDR_PROTECTION_EN_OFFSET);
 }

 static void sifive_ddr_start(volatile u32 *ctl, u32 *physical_filter_ctrl,
 			     u64 ddr_end)
 {
 	volatile u64 *filterreg = (volatile u64 *)physical_filter_ctrl;

 	setbits_le32(DENALI_CTL_0 + ctl, 0x1);

 	wait_for_bit_le32((void *)ctl + DENALI_CTL_132,
 			  BIT(MC_INIT_COMPLETE_OFFSET), false, 100, false);

 	/* Disable the BusBlocker in front of the controller AXI slave ports */
 	filterreg[0] = 0x0f00000000000000UL | (ddr_end >> 2);
 }

 static void sifive_ddr_check_errata(u32 regbase, u32 updownreg)
 {
 	u64 fails     = 0;
 	u32 dq        = 0;
 	u32 down, up;
 	u8 failc0, failc1;
 	u32 phy_rx_cal_dqn_0_offset;

 	for (u32 bit = 0; bit < 2; bit++) {
 		if (bit == 0) {
 			phy_rx_cal_dqn_0_offset =
 				PHY_RX_CAL_DQ0_0_OFFSET;
 		} else {
 			phy_rx_cal_dqn_0_offset =
 				PHY_RX_CAL_DQ1_0_OFFSET;
 		}

 		down = (updownreg >>
 			phy_rx_cal_dqn_0_offset) & 0x3F;
 		up = (updownreg >>
 		      (phy_rx_cal_dqn_0_offset + 6)) &
 		      0x3F;

 		failc0 = ((down == 0) && (up == 0x3F));
 		failc1 = ((up == 0) && (down == 0x3F));

 		/* print error message on failure */
 		if (failc0 || failc1) {
 			if (fails == 0)
 				printf("DDR error in fixing up\n");

 			fails |= (1 << dq);

 			char slicelsc = '0';
 			char slicemsc = '0';

 			slicelsc += (dq % 10);
 			slicemsc += (dq / 10);
 			printf("S ");
 			printf("%c", slicemsc);
 			printf("%c", slicelsc);

 			if (failc0)
 				printf("U");
 			else
 				printf("D");

 			printf("\n");
 		}
 		dq++;
 	}
 }

 static u64 sifive_ddr_phy_fixup(volatile u32 *ddrphyreg)
 {
 	u32 slicebase = 0;

 	/* check errata condition */
 	for (u32 slice = 0; slice < 8; slice++) {
 		u32 regbase = slicebase + 34;

 		for (u32 reg = 0; reg < 4; reg++) {
 			u32 updownreg = readl(regbase + reg + ddrphyreg);

 			sifive_ddr_check_errata(regbase, updownreg);
 		}
 		slicebase += 128;
 	}

 	return(0);
 }

 static u32 sifive_ddr_get_dram_class(volatile u32 *ctl)
 {
 	u32 reg = readl(DENALI_CTL_0 + ctl);

 	return ((reg >> DRAM_CLASS_OFFSET) & 0xF);
 }

 static int sifive_ddr_setup(struct udevice *dev)
 {
 	struct sifive_ddr_info *priv = dev_get_priv(dev);
 	struct sifive_dmc_plat *plat = dev_get_plat(dev);
 	struct sifive_ddr_params *params = &plat->ddr_params;
 	volatile u32 *denali_ctl =  priv->ctl->denali_ctl;
 	volatile u32 *denali_phy =  priv->phy->denali_phy;
 	const u64 ddr_size = priv->info.size;
 	const u64 ddr_end = priv->info.base + ddr_size;
 	int ret, i;
 	u32 physet;

 	ret = dev_read_u32_array(dev, "sifive,ddr-params",
 				 (u32 *)&plat->ddr_params,
 				 sizeof(plat->ddr_params) / sizeof(u32));
 	if (ret) {
 		printf("%s: Cannot read sifive,ddr-params %d\n",
 		       __func__, ret);
 		return ret;
 	}

 	sdram_copy_to_reg(priv->ctl->denali_ctl,
 			  params->pctl_regs.denali_ctl,
 			  sizeof(struct sifive_ddrctl));

 	/* phy reset */
 	for (i = DENALI_PHY_1152; i <= DENALI_PHY_1214; i++) {
 		physet = params->phy_regs.denali_phy[i];
 		priv->phy->denali_phy[i] = physet;
 	}

 	for (i = 0; i < DENALI_PHY_1152; i++) {
 		physet = params->phy_regs.denali_phy[i];
 		priv->phy->denali_phy[i] = physet;
 	}

 	/* Disable read interleave DENALI_CTL_120 */
 	setbits_le32(DENALI_CTL_120 + denali_ctl,
 		     1 << DISABLE_RD_INTERLEAVE_OFFSET);

 	/* Disable optimal read/modify/write logic DENALI_CTL_21 */
 	clrbits_le32(DENALI_CTL_21 + denali_ctl, 1 << OPTIMAL_RMODW_EN_OFFSET);

 	/* Enable write Leveling DENALI_CTL_170 */
 	setbits_le32(DENALI_CTL_170 + denali_ctl, (1 << WRLVL_EN_OFFSET)
 		     | (1 << DFI_PHY_WRLELV_MODE_OFFSET));

 	/* Enable read leveling DENALI_CTL_181 and DENALI_CTL_260 */
 	setbits_le32(DENALI_CTL_181 + denali_ctl,
 		     1 << DFI_PHY_RDLVL_MODE_OFFSET);
 	setbits_le32(DENALI_CTL_260 + denali_ctl, 1 << RDLVL_EN_OFFSET);

 	/* Enable read leveling gate DENALI_CTL_260 and DENALI_CTL_182 */
 	setbits_le32(DENALI_CTL_260 + denali_ctl, 1 << RDLVL_GATE_EN_OFFSET);
 	setbits_le32(DENALI_CTL_182 + denali_ctl,
 		     1 << DFI_PHY_RDLVL_GATE_MODE_OFFSET);

 	if (sifive_ddr_get_dram_class(denali_ctl) == DRAM_CLASS_DDR4) {
 		/* Enable vref training DENALI_CTL_184 */
 		setbits_le32(DENALI_CTL_184 + denali_ctl, 1 << VREF_EN_OFFSET);
 	}

 	/* Mask off leveling completion interrupt DENALI_CTL_136 */
 	setbits_le32(DENALI_CTL_136 + denali_ctl,
 		     1 << LEVELING_OPERATION_COMPLETED_OFFSET);

 	/* Mask off MC init complete interrupt DENALI_CTL_136 */
 	setbits_le32(DENALI_CTL_136 + denali_ctl, 1 << MC_INIT_COMPLETE_OFFSET);

 	/* Mask off out of range interrupts DENALI_CTL_136 */
 	setbits_le32(DENALI_CTL_136 + denali_ctl, (1 << OUT_OF_RANGE_OFFSET)
 		     | (1 << MULTIPLE_OUT_OF_RANGE_OFFSET));

 	/* set up range protection */
 	sifive_ddr_setup_range_protection(denali_ctl, priv->info.size);

 	/* Mask off port command error interrupt DENALI_CTL_136 */
 	setbits_le32(DENALI_CTL_136 + denali_ctl,
 		     1 << PORT_COMMAND_CHANNEL_ERROR_OFFSET);

 	sifive_ddr_start(denali_ctl, priv->physical_filter_ctrl, ddr_end);

 	sifive_ddr_phy_fixup(denali_phy);

 	/* check size */
 	priv->info.size = get_ram_size((long *)priv->info.base,
 				       ddr_size);

 	debug("%s : %lx\n", __func__, (uintptr_t)priv->info.size);

 	/* check memory access for all memory */
 	if (priv->info.size != ddr_size) {
 		printf("DDR invalid size : 0x%lx, expected 0x%lx\n",
 		       (uintptr_t)priv->info.size, (uintptr_t)ddr_size);
 		return -EINVAL;
 	}

 	return 0;
 }
 #endif

 static int sifive_ddr_probe(struct udevice *dev)
 {
 	struct sifive_ddr_info *priv = dev_get_priv(dev);

 	/* Read memory base and size from DT */
 	fdtdec_setup_mem_size_base();
 	priv->info.base = gd->ram_base;
 	priv->info.size = gd->ram_size;

 #if defined(CONFIG_SPL_BUILD)
 	int ret;
 	u32 clock = 0;

 	debug("sifive DDR probe\n");
 	priv->dev = dev;

 	ret = clk_get_by_index(dev, 0, &priv->ddr_clk);
 	if (ret) {
 		debug("clk get failed %d\n", ret);
 		return ret;
 	}

 	ret = dev_read_u32(dev, "clock-frequency", &clock);
 	if (ret) {
 		debug("clock-frequency not found in dt %d\n", ret);
 		return ret;
 	} else {
 		ret = clk_set_rate(&priv->ddr_clk, clock);
 		if (ret < 0) {
 			debug("Could not set DDR clock\n");
 			return ret;
 		}
 	}

 	ret = clk_enable(&priv->ddr_clk);
 	if (ret < 0) {
 		debug("Could not enable DDR clock\n");
 		return ret;
 	}

 	priv->ctl = (struct sifive_ddrctl *)dev_read_addr_index(dev, 0);
 	priv->phy = (struct sifive_ddrphy *)dev_read_addr_index(dev, 1);
 	priv->physical_filter_ctrl = (u32 *)dev_read_addr_index(dev, 2);

 	return sifive_ddr_setup(dev);
 #endif

 	return 0;
 }

 static int sifive_ddr_get_info(struct udevice *dev, struct ram_info *info)
 {
 	struct sifive_ddr_info *priv = dev_get_priv(dev);

 	*info = priv->info;

 	return 0;
 }

 static struct ram_ops sifive_ddr_ops = {
 	.get_info = sifive_ddr_get_info,
 };

 static const struct udevice_id sifive_ddr_ids[] = {
 	{ .compatible = "sifive,fu540-c000-ddr" },
 	{ .compatible = "sifive,fu740-c000-ddr" },
 	{ }
 };

 U_BOOT_DRIVER(sifive_ddr) = {
 	.name = "sifive_ddr",
 	.id = UCLASS_RAM,
 	.of_match = sifive_ddr_ids,
 	.ops = &sifive_ddr_ops,
 	.probe = sifive_ddr_probe,
 	.priv_auto = sizeof(struct sifive_ddr_info),
 #if defined(CONFIG_SPL_BUILD)
 	.plat_auto = sizeof(struct sifive_dmc_plat),
 #endif
 };
	// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
	/*
	* (C) Copyright 2020-2021 SiFive, Inc.
	*
	* Authors:
	* Pragnesh Patel <pragnesh.patel@sifive.com>
	*/

	#include <common.h>
	#include <dm.h>
	#include <fdtdec.h>
	#include <init.h>
	#include <ram.h>
	#include <syscon.h>
	#include <asm/global_data.h>
	#include <asm/io.h>
	#include <clk.h>
	#include <wait_bit.h>
	#include <linux/bitops.h>

	#define DENALI_CTL_0 0
	#define DENALI_CTL_21 21
	#define DENALI_CTL_120 120
	#define DENALI_CTL_132 132
	#define DENALI_CTL_136 136
	#define DENALI_CTL_170 170
	#define DENALI_CTL_181 181
	#define DENALI_CTL_182 182
	#define DENALI_CTL_184 184
	#define DENALI_CTL_208 208
	#define DENALI_CTL_209 209
	#define DENALI_CTL_210 210
	#define DENALI_CTL_212 212
	#define DENALI_CTL_214 214
	#define DENALI_CTL_216 216
	#define DENALI_CTL_224 224
	#define DENALI_CTL_225 225
	#define DENALI_CTL_260 260

	#define DENALI_PHY_1152 1152
	#define DENALI_PHY_1214 1214

	#define DRAM_CLASS_OFFSET 8
	#define DRAM_CLASS_DDR4 0xA
	#define OPTIMAL_RMODW_EN_OFFSET 0
	#define DISABLE_RD_INTERLEAVE_OFFSET 16
	#define OUT_OF_RANGE_OFFSET 1
	#define MULTIPLE_OUT_OF_RANGE_OFFSET 2
	#define PORT_COMMAND_CHANNEL_ERROR_OFFSET 7
	#define MC_INIT_COMPLETE_OFFSET 8
	#define LEVELING_OPERATION_COMPLETED_OFFSET 22
	#define DFI_PHY_WRLELV_MODE_OFFSET 24
	#define DFI_PHY_RDLVL_MODE_OFFSET 24
	#define DFI_PHY_RDLVL_GATE_MODE_OFFSET 0
	#define VREF_EN_OFFSET 24
	#define PORT_ADDR_PROTECTION_EN_OFFSET 0
	#define AXI0_ADDRESS_RANGE_ENABLE 8
	#define AXI0_RANGE_PROT_BITS_0_OFFSET 24
	#define RDLVL_EN_OFFSET 16
	#define RDLVL_GATE_EN_OFFSET 24
	#define WRLVL_EN_OFFSET 0

	#define PHY_RX_CAL_DQ0_0_OFFSET 0
	#define PHY_RX_CAL_DQ1_0_OFFSET 16

	DECLARE_GLOBAL_DATA_PTR;

	struct sifive_ddrctl {
	volatile u32 denali_ctl[265];
	};

	struct sifive_ddrphy {
	volatile u32 denali_phy[1215];
	};

	/**
	* struct sifive_ddr_info
	*
	* @dev : pointer for the device
	* @info : UCLASS RAM information
	* @ctl : DDR controller base address
	* @phy : DDR PHY base address
	* @ctrl : DDR control base address
	* @physical_filter_ctrl : DDR physical filter control base address
	*/
	struct sifive_ddr_info {
	struct udevice *dev;
	struct ram_info info;
	struct sifive_ddrctl *ctl;
	struct sifive_ddrphy *phy;
	struct clk ddr_clk;
	u32 *physical_filter_ctrl;
	};

	#if defined(CONFIG_SPL_BUILD)
	struct sifive_ddr_params {
	struct sifive_ddrctl pctl_regs;
	struct sifive_ddrphy phy_regs;
	};

	struct sifive_dmc_plat {
	struct sifive_ddr_params ddr_params;
	};

	/*
	* TODO : It can be possible to use common sdram_copy_to_reg() API
	* n: Unit bytes
	*/
	static void sdram_copy_to_reg(volatile u32 *dest,
	volatile u32 *src, u32 n)
	{
	int i;

	for (i = 0; i < n / sizeof(u32); i++) {
	writel(*src, dest);
	src++;
	dest++;
	}
	}

	static void sifive_ddr_setup_range_protection(volatile u32 *ctl, u64 end_addr)
	{
	u32 end_addr_16kblocks = ((end_addr >> 14) & 0x7FFFFF) - 1;

	writel(0x0, DENALI_CTL_209 + ctl);
	writel(end_addr_16kblocks, DENALI_CTL_210 + ctl);
	writel(0x0, DENALI_CTL_212 + ctl);
	writel(0x0, DENALI_CTL_214 + ctl);
	writel(0x0, DENALI_CTL_216 + ctl);
	setbits_le32(DENALI_CTL_224 + ctl,
	0x3 << AXI0_RANGE_PROT_BITS_0_OFFSET);
	writel(0xFFFFFFFF, DENALI_CTL_225 + ctl);
	setbits_le32(DENALI_CTL_208 + ctl, 0x1 << AXI0_ADDRESS_RANGE_ENABLE);
	setbits_le32(DENALI_CTL_208 + ctl,
	0x1 << PORT_ADDR_PROTECTION_EN_OFFSET);
	}

	static void sifive_ddr_start(volatile u32 ctl, u32 physical_filter_ctrl,
	u64 ddr_end)
	{
	volatile u64 filterreg = (volatile u64 )physical_filter_ctrl;

	setbits_le32(DENALI_CTL_0 + ctl, 0x1);

	wait_for_bit_le32((void *)ctl + DENALI_CTL_132,
	BIT(MC_INIT_COMPLETE_OFFSET), false, 100, false);

	/* Disable the BusBlocker in front of the controller AXI slave ports */
	filterreg[0] = 0x0f00000000000000UL \| (ddr_end >> 2);
	}

	static void sifive_ddr_check_errata(u32 regbase, u32 updownreg)
	{
	u64 fails = 0;
	u32 dq = 0;
	u32 down, up;
	u8 failc0, failc1;
	u32 phy_rx_cal_dqn_0_offset;

	for (u32 bit = 0; bit < 2; bit++) {
	if (bit == 0) {
	phy_rx_cal_dqn_0_offset =
	PHY_RX_CAL_DQ0_0_OFFSET;
	} else {
	phy_rx_cal_dqn_0_offset =
	PHY_RX_CAL_DQ1_0_OFFSET;
	}

	down = (updownreg >>
	phy_rx_cal_dqn_0_offset) & 0x3F;
	up = (updownreg >>
	(phy_rx_cal_dqn_0_offset + 6)) &
	0x3F;

	failc0 = ((down == 0) && (up == 0x3F));
	failc1 = ((up == 0) && (down == 0x3F));

	/* print error message on failure */
	if (failc0 \|\| failc1) {
	if (fails == 0)
	printf("DDR error in fixing up\n");

	fails \|= (1 << dq);

	char slicelsc = '0';
	char slicemsc = '0';

	slicelsc += (dq % 10);
	slicemsc += (dq / 10);
	printf("S ");
	printf("%c", slicemsc);
	printf("%c", slicelsc);

	if (failc0)
	printf("U");
	else
	printf("D");

	printf("\n");
	}
	dq++;
	}
	}

	static u64 sifive_ddr_phy_fixup(volatile u32 *ddrphyreg)
	{
	u32 slicebase = 0;

	/* check errata condition */
	for (u32 slice = 0; slice < 8; slice++) {
	u32 regbase = slicebase + 34;

	for (u32 reg = 0; reg < 4; reg++) {
	u32 updownreg = readl(regbase + reg + ddrphyreg);

	sifive_ddr_check_errata(regbase, updownreg);
	}
	slicebase += 128;
	}

	return(0);
	}

	static u32 sifive_ddr_get_dram_class(volatile u32 *ctl)
	{
	u32 reg = readl(DENALI_CTL_0 + ctl);

	return ((reg >> DRAM_CLASS_OFFSET) & 0xF);
	}

	static int sifive_ddr_setup(struct udevice *dev)
	{
	struct sifive_ddr_info *priv = dev_get_priv(dev);
	struct sifive_dmc_plat *plat = dev_get_plat(dev);
	struct sifive_ddr_params *params = &plat->ddr_params;
	volatile u32 *denali_ctl = priv->ctl->denali_ctl;
	volatile u32 *denali_phy = priv->phy->denali_phy;
	const u64 ddr_size = priv->info.size;
	const u64 ddr_end = priv->info.base + ddr_size;
	int ret, i;
	u32 physet;

	ret = dev_read_u32_array(dev, "sifive,ddr-params",
	(u32 *)&plat->ddr_params,
	sizeof(plat->ddr_params) / sizeof(u32));
	if (ret) {
	printf("%s: Cannot read sifive,ddr-params %d\n",
	__func__, ret);
	return ret;
	}

	sdram_copy_to_reg(priv->ctl->denali_ctl,
	params->pctl_regs.denali_ctl,
	sizeof(struct sifive_ddrctl));

	/* phy reset */
	for (i = DENALI_PHY_1152; i <= DENALI_PHY_1214; i++) {
	physet = params->phy_regs.denali_phy[i];
	priv->phy->denali_phy[i] = physet;
	}

	for (i = 0; i < DENALI_PHY_1152; i++) {
	physet = params->phy_regs.denali_phy[i];
	priv->phy->denali_phy[i] = physet;
	}

	/* Disable read interleave DENALI_CTL_120 */
	setbits_le32(DENALI_CTL_120 + denali_ctl,
	1 << DISABLE_RD_INTERLEAVE_OFFSET);

	/* Disable optimal read/modify/write logic DENALI_CTL_21 */
	clrbits_le32(DENALI_CTL_21 + denali_ctl, 1 << OPTIMAL_RMODW_EN_OFFSET);

	/* Enable write Leveling DENALI_CTL_170 */
	setbits_le32(DENALI_CTL_170 + denali_ctl, (1 << WRLVL_EN_OFFSET)
	\| (1 << DFI_PHY_WRLELV_MODE_OFFSET));

	/* Enable read leveling DENALI_CTL_181 and DENALI_CTL_260 */
	setbits_le32(DENALI_CTL_181 + denali_ctl,
	1 << DFI_PHY_RDLVL_MODE_OFFSET);
	setbits_le32(DENALI_CTL_260 + denali_ctl, 1 << RDLVL_EN_OFFSET);

	/* Enable read leveling gate DENALI_CTL_260 and DENALI_CTL_182 */
	setbits_le32(DENALI_CTL_260 + denali_ctl, 1 << RDLVL_GATE_EN_OFFSET);
	setbits_le32(DENALI_CTL_182 + denali_ctl,
	1 << DFI_PHY_RDLVL_GATE_MODE_OFFSET);

	if (sifive_ddr_get_dram_class(denali_ctl) == DRAM_CLASS_DDR4) {
	/* Enable vref training DENALI_CTL_184 */
	setbits_le32(DENALI_CTL_184 + denali_ctl, 1 << VREF_EN_OFFSET);
	}

	/* Mask off leveling completion interrupt DENALI_CTL_136 */
	setbits_le32(DENALI_CTL_136 + denali_ctl,
	1 << LEVELING_OPERATION_COMPLETED_OFFSET);

	/* Mask off MC init complete interrupt DENALI_CTL_136 */
	setbits_le32(DENALI_CTL_136 + denali_ctl, 1 << MC_INIT_COMPLETE_OFFSET);

	/* Mask off out of range interrupts DENALI_CTL_136 */
	setbits_le32(DENALI_CTL_136 + denali_ctl, (1 << OUT_OF_RANGE_OFFSET)
	\| (1 << MULTIPLE_OUT_OF_RANGE_OFFSET));

	/* set up range protection */
	sifive_ddr_setup_range_protection(denali_ctl, priv->info.size);

	/* Mask off port command error interrupt DENALI_CTL_136 */
	setbits_le32(DENALI_CTL_136 + denali_ctl,
	1 << PORT_COMMAND_CHANNEL_ERROR_OFFSET);

	sifive_ddr_start(denali_ctl, priv->physical_filter_ctrl, ddr_end);

	sifive_ddr_phy_fixup(denali_phy);

	/* check size */
	priv->info.size = get_ram_size((long *)priv->info.base,
	ddr_size);

	debug("%s : %lx\n", __func__, (uintptr_t)priv->info.size);

	/* check memory access for all memory */
	if (priv->info.size != ddr_size) {
	printf("DDR invalid size : 0x%lx, expected 0x%lx\n",
	(uintptr_t)priv->info.size, (uintptr_t)ddr_size);
	return -EINVAL;
	}

	return 0;
	}
	#endif

	static int sifive_ddr_probe(struct udevice *dev)
	{
	struct sifive_ddr_info *priv = dev_get_priv(dev);

	/* Read memory base and size from DT */
	fdtdec_setup_mem_size_base();
	priv->info.base = gd->ram_base;
	priv->info.size = gd->ram_size;

	#if defined(CONFIG_SPL_BUILD)
	int ret;
	u32 clock = 0;

	debug("sifive DDR probe\n");
	priv->dev = dev;

	ret = clk_get_by_index(dev, 0, &priv->ddr_clk);
	if (ret) {
	debug("clk get failed %d\n", ret);
	return ret;
	}

	ret = dev_read_u32(dev, "clock-frequency", &clock);
	if (ret) {
	debug("clock-frequency not found in dt %d\n", ret);
	return ret;
	} else {
	ret = clk_set_rate(&priv->ddr_clk, clock);
	if (ret < 0) {
	debug("Could not set DDR clock\n");
	return ret;
	}
	}

	ret = clk_enable(&priv->ddr_clk);
	if (ret < 0) {
	debug("Could not enable DDR clock\n");
	return ret;
	}

	priv->ctl = (struct sifive_ddrctl *)dev_read_addr_index(dev, 0);
	priv->phy = (struct sifive_ddrphy *)dev_read_addr_index(dev, 1);
	priv->physical_filter_ctrl = (u32 *)dev_read_addr_index(dev, 2);

	return sifive_ddr_setup(dev);
	#endif

	return 0;
	}

	static int sifive_ddr_get_info(struct udevice dev, struct ram_info info)
	{
	struct sifive_ddr_info *priv = dev_get_priv(dev);

	*info = priv->info;

	return 0;
	}

	static struct ram_ops sifive_ddr_ops = {
	.get_info = sifive_ddr_get_info,
	};

	static const struct udevice_id sifive_ddr_ids[] = {
	{ .compatible = "sifive,fu540-c000-ddr" },
	{ .compatible = "sifive,fu740-c000-ddr" },
	{ }
	};

	U_BOOT_DRIVER(sifive_ddr) = {
	.name = "sifive_ddr",
	.id = UCLASS_RAM,
	.of_match = sifive_ddr_ids,
	.ops = &sifive_ddr_ops,
	.probe = sifive_ddr_probe,
	.priv_auto = sizeof(struct sifive_ddr_info),
	#if defined(CONFIG_SPL_BUILD)
	.plat_auto = sizeof(struct sifive_dmc_plat),
	#endif
	};