xref: /openbmc/linux/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c (revision 164a9ebe)

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018-19, Linaro Limited

#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include "stmmac.h"
#include "stmmac_platform.h"

#define RGMII_IO_MACRO_CONFIG		0x0
#define SDCC_HC_REG_DLL_CONFIG		0x4
#define SDCC_HC_REG_DDR_CONFIG		0xC
#define SDCC_HC_REG_DLL_CONFIG2		0x10
#define SDC4_STATUS			0x14
#define SDCC_USR_CTL			0x18
#define RGMII_IO_MACRO_CONFIG2		0x1C
#define RGMII_IO_MACRO_DEBUG1		0x20
#define EMAC_SYSTEM_LOW_POWER_DEBUG	0x28

/* RGMII_IO_MACRO_CONFIG fields */
#define RGMII_CONFIG_FUNC_CLK_EN		BIT(30)
#define RGMII_CONFIG_POS_NEG_DATA_SEL		BIT(23)
#define RGMII_CONFIG_GPIO_CFG_RX_INT		GENMASK(21, 20)
#define RGMII_CONFIG_GPIO_CFG_TX_INT		GENMASK(19, 17)
#define RGMII_CONFIG_MAX_SPD_PRG_9		GENMASK(16, 8)
#define RGMII_CONFIG_MAX_SPD_PRG_2		GENMASK(7, 6)
#define RGMII_CONFIG_INTF_SEL			GENMASK(5, 4)
#define RGMII_CONFIG_BYPASS_TX_ID_EN		BIT(3)
#define RGMII_CONFIG_LOOPBACK_EN		BIT(2)
#define RGMII_CONFIG_PROG_SWAP			BIT(1)
#define RGMII_CONFIG_DDR_MODE			BIT(0)

/* SDCC_HC_REG_DLL_CONFIG fields */
#define SDCC_DLL_CONFIG_DLL_RST			BIT(30)
#define SDCC_DLL_CONFIG_PDN			BIT(29)
#define SDCC_DLL_CONFIG_MCLK_FREQ		GENMASK(26, 24)
#define SDCC_DLL_CONFIG_CDR_SELEXT		GENMASK(23, 20)
#define SDCC_DLL_CONFIG_CDR_EXT_EN		BIT(19)
#define SDCC_DLL_CONFIG_CK_OUT_EN		BIT(18)
#define SDCC_DLL_CONFIG_CDR_EN			BIT(17)
#define SDCC_DLL_CONFIG_DLL_EN			BIT(16)
#define SDCC_DLL_MCLK_GATING_EN			BIT(5)
#define SDCC_DLL_CDR_FINE_PHASE			GENMASK(3, 2)

/* SDCC_HC_REG_DDR_CONFIG fields */
#define SDCC_DDR_CONFIG_PRG_DLY_EN		BIT(31)
#define SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY	GENMASK(26, 21)
#define SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_CODE	GENMASK(29, 27)
#define SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_EN	BIT(30)
#define SDCC_DDR_CONFIG_PRG_RCLK_DLY		GENMASK(8, 0)

/* SDCC_HC_REG_DLL_CONFIG2 fields */
#define SDCC_DLL_CONFIG2_DLL_CLOCK_DIS		BIT(21)
#define SDCC_DLL_CONFIG2_MCLK_FREQ_CALC		GENMASK(17, 10)
#define SDCC_DLL_CONFIG2_DDR_TRAFFIC_INIT_SEL	GENMASK(3, 2)
#define SDCC_DLL_CONFIG2_DDR_TRAFFIC_INIT_SW	BIT(1)
#define SDCC_DLL_CONFIG2_DDR_CAL_EN		BIT(0)

/* SDC4_STATUS bits */
#define SDC4_STATUS_DLL_LOCK			BIT(7)

/* RGMII_IO_MACRO_CONFIG2 fields */
#define RGMII_CONFIG2_RSVD_CONFIG15		GENMASK(31, 17)
#define RGMII_CONFIG2_RGMII_CLK_SEL_CFG		BIT(16)
#define RGMII_CONFIG2_TX_TO_RX_LOOPBACK_EN	BIT(13)
#define RGMII_CONFIG2_CLK_DIVIDE_SEL		BIT(12)
#define RGMII_CONFIG2_RX_PROG_SWAP		BIT(7)
#define RGMII_CONFIG2_DATA_DIVIDE_CLK_SEL	BIT(6)
#define RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN	BIT(5)

struct ethqos_emac_por {
	unsigned int offset;
	unsigned int value;
};

struct ethqos_emac_driver_data {
	const struct ethqos_emac_por *por;
	unsigned int num_por;
	bool rgmii_config_looback_en;
};

struct qcom_ethqos {
	struct platform_device *pdev;
	void __iomem *rgmii_base;

	unsigned int rgmii_clk_rate;
	struct clk *rgmii_clk;
	unsigned int speed;

	const struct ethqos_emac_por *por;
	unsigned int num_por;
	bool rgmii_config_looback_en;
};

static int rgmii_readl(struct qcom_ethqos *ethqos, unsigned int offset)
{
	return readl(ethqos->rgmii_base + offset);
}

static void rgmii_writel(struct qcom_ethqos *ethqos,
			 int value, unsigned int offset)
{
	writel(value, ethqos->rgmii_base + offset);
}

static void rgmii_updatel(struct qcom_ethqos *ethqos,
			  int mask, int val, unsigned int offset)
{
	unsigned int temp;

	temp =  rgmii_readl(ethqos, offset);
	temp = (temp & ~(mask)) | val;
	rgmii_writel(ethqos, temp, offset);
}

static void rgmii_dump(void *priv)
{
	struct qcom_ethqos *ethqos = priv;

	dev_dbg(&ethqos->pdev->dev, "Rgmii register dump\n");
	dev_dbg(&ethqos->pdev->dev, "RGMII_IO_MACRO_CONFIG: %x\n",
		rgmii_readl(ethqos, RGMII_IO_MACRO_CONFIG));
	dev_dbg(&ethqos->pdev->dev, "SDCC_HC_REG_DLL_CONFIG: %x\n",
		rgmii_readl(ethqos, SDCC_HC_REG_DLL_CONFIG));
	dev_dbg(&ethqos->pdev->dev, "SDCC_HC_REG_DDR_CONFIG: %x\n",
		rgmii_readl(ethqos, SDCC_HC_REG_DDR_CONFIG));
	dev_dbg(&ethqos->pdev->dev, "SDCC_HC_REG_DLL_CONFIG2: %x\n",
		rgmii_readl(ethqos, SDCC_HC_REG_DLL_CONFIG2));
	dev_dbg(&ethqos->pdev->dev, "SDC4_STATUS: %x\n",
		rgmii_readl(ethqos, SDC4_STATUS));
	dev_dbg(&ethqos->pdev->dev, "SDCC_USR_CTL: %x\n",
		rgmii_readl(ethqos, SDCC_USR_CTL));
	dev_dbg(&ethqos->pdev->dev, "RGMII_IO_MACRO_CONFIG2: %x\n",
		rgmii_readl(ethqos, RGMII_IO_MACRO_CONFIG2));
	dev_dbg(&ethqos->pdev->dev, "RGMII_IO_MACRO_DEBUG1: %x\n",
		rgmii_readl(ethqos, RGMII_IO_MACRO_DEBUG1));
	dev_dbg(&ethqos->pdev->dev, "EMAC_SYSTEM_LOW_POWER_DEBUG: %x\n",
		rgmii_readl(ethqos, EMAC_SYSTEM_LOW_POWER_DEBUG));
}

/* Clock rates */
#define RGMII_1000_NOM_CLK_FREQ			(250 * 1000 * 1000UL)
#define RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ	 (50 * 1000 * 1000UL)
#define RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ	  (5 * 1000 * 1000UL)

static void
ethqos_update_rgmii_clk(struct qcom_ethqos *ethqos, unsigned int speed)
{
	switch (speed) {
	case SPEED_1000:
		ethqos->rgmii_clk_rate =  RGMII_1000_NOM_CLK_FREQ;
		break;

	case SPEED_100:
		ethqos->rgmii_clk_rate =  RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ;
		break;

	case SPEED_10:
		ethqos->rgmii_clk_rate =  RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ;
		break;
	}

	clk_set_rate(ethqos->rgmii_clk, ethqos->rgmii_clk_rate);
}

static void ethqos_set_func_clk_en(struct qcom_ethqos *ethqos)
{
	rgmii_updatel(ethqos, RGMII_CONFIG_FUNC_CLK_EN,
		      RGMII_CONFIG_FUNC_CLK_EN, RGMII_IO_MACRO_CONFIG);
}

static const struct ethqos_emac_por emac_v2_3_0_por[] = {
	{ .offset = RGMII_IO_MACRO_CONFIG,	.value = 0x00C01343 },
	{ .offset = SDCC_HC_REG_DLL_CONFIG,	.value = 0x2004642C },
	{ .offset = SDCC_HC_REG_DDR_CONFIG,	.value = 0x00000000 },
	{ .offset = SDCC_HC_REG_DLL_CONFIG2,	.value = 0x00200000 },
	{ .offset = SDCC_USR_CTL,		.value = 0x00010800 },
	{ .offset = RGMII_IO_MACRO_CONFIG2,	.value = 0x00002060 },
};

static const struct ethqos_emac_driver_data emac_v2_3_0_data = {
	.por = emac_v2_3_0_por,
	.num_por = ARRAY_SIZE(emac_v2_3_0_por),
	.rgmii_config_looback_en = true,
};

static const struct ethqos_emac_por emac_v2_1_0_por[] = {
	{ .offset = RGMII_IO_MACRO_CONFIG,	.value = 0x40C01343 },
	{ .offset = SDCC_HC_REG_DLL_CONFIG,	.value = 0x2004642C },
	{ .offset = SDCC_HC_REG_DDR_CONFIG,	.value = 0x00000000 },
	{ .offset = SDCC_HC_REG_DLL_CONFIG2,	.value = 0x00200000 },
	{ .offset = SDCC_USR_CTL,		.value = 0x00010800 },
	{ .offset = RGMII_IO_MACRO_CONFIG2,	.value = 0x00002060 },
};

static const struct ethqos_emac_driver_data emac_v2_1_0_data = {
	.por = emac_v2_1_0_por,
	.num_por = ARRAY_SIZE(emac_v2_1_0_por),
	.rgmii_config_looback_en = false,
};

static int ethqos_dll_configure(struct qcom_ethqos *ethqos)
{
	unsigned int val;
	int retry = 1000;

	/* Set CDR_EN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_CDR_EN,
		      SDCC_DLL_CONFIG_CDR_EN, SDCC_HC_REG_DLL_CONFIG);

	/* Set CDR_EXT_EN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_CDR_EXT_EN,
		      SDCC_DLL_CONFIG_CDR_EXT_EN, SDCC_HC_REG_DLL_CONFIG);

	/* Clear CK_OUT_EN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_CK_OUT_EN,
		      0, SDCC_HC_REG_DLL_CONFIG);

	/* Set DLL_EN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_DLL_EN,
		      SDCC_DLL_CONFIG_DLL_EN, SDCC_HC_REG_DLL_CONFIG);

	rgmii_updatel(ethqos, SDCC_DLL_MCLK_GATING_EN,
		      0, SDCC_HC_REG_DLL_CONFIG);

	rgmii_updatel(ethqos, SDCC_DLL_CDR_FINE_PHASE,
		      0, SDCC_HC_REG_DLL_CONFIG);

	/* Wait for CK_OUT_EN clear */
	do {
		val = rgmii_readl(ethqos, SDCC_HC_REG_DLL_CONFIG);
		val &= SDCC_DLL_CONFIG_CK_OUT_EN;
		if (!val)
			break;
		mdelay(1);
		retry--;
	} while (retry > 0);
	if (!retry)
		dev_err(&ethqos->pdev->dev, "Clear CK_OUT_EN timedout\n");

	/* Set CK_OUT_EN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_CK_OUT_EN,
		      SDCC_DLL_CONFIG_CK_OUT_EN, SDCC_HC_REG_DLL_CONFIG);

	/* Wait for CK_OUT_EN set */
	retry = 1000;
	do {
		val = rgmii_readl(ethqos, SDCC_HC_REG_DLL_CONFIG);
		val &= SDCC_DLL_CONFIG_CK_OUT_EN;
		if (val)
			break;
		mdelay(1);
		retry--;
	} while (retry > 0);
	if (!retry)
		dev_err(&ethqos->pdev->dev, "Set CK_OUT_EN timedout\n");

	/* Set DDR_CAL_EN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG2_DDR_CAL_EN,
		      SDCC_DLL_CONFIG2_DDR_CAL_EN, SDCC_HC_REG_DLL_CONFIG2);

	rgmii_updatel(ethqos, SDCC_DLL_CONFIG2_DLL_CLOCK_DIS,
		      0, SDCC_HC_REG_DLL_CONFIG2);

	rgmii_updatel(ethqos, SDCC_DLL_CONFIG2_MCLK_FREQ_CALC,
		      0x1A << 10, SDCC_HC_REG_DLL_CONFIG2);

	rgmii_updatel(ethqos, SDCC_DLL_CONFIG2_DDR_TRAFFIC_INIT_SEL,
		      BIT(2), SDCC_HC_REG_DLL_CONFIG2);

	rgmii_updatel(ethqos, SDCC_DLL_CONFIG2_DDR_TRAFFIC_INIT_SW,
		      SDCC_DLL_CONFIG2_DDR_TRAFFIC_INIT_SW,
		      SDCC_HC_REG_DLL_CONFIG2);

	return 0;
}

static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
{
	int phase_shift;
	int phy_mode;

	/* Determine if the PHY adds a 2 ns TX delay or the MAC handles it */
	phy_mode = device_get_phy_mode(&ethqos->pdev->dev);
	if (phy_mode == PHY_INTERFACE_MODE_RGMII_ID ||
	    phy_mode == PHY_INTERFACE_MODE_RGMII_TXID)
		phase_shift = 0;
	else
		phase_shift = RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN;

	/* Disable loopback mode */
	rgmii_updatel(ethqos, RGMII_CONFIG2_TX_TO_RX_LOOPBACK_EN,
		      0, RGMII_IO_MACRO_CONFIG2);

	/* Select RGMII, write 0 to interface select */
	rgmii_updatel(ethqos, RGMII_CONFIG_INTF_SEL,
		      0, RGMII_IO_MACRO_CONFIG);

	switch (ethqos->speed) {
	case SPEED_1000:
		rgmii_updatel(ethqos, RGMII_CONFIG_DDR_MODE,
			      RGMII_CONFIG_DDR_MODE, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_BYPASS_TX_ID_EN,
			      0, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_POS_NEG_DATA_SEL,
			      RGMII_CONFIG_POS_NEG_DATA_SEL,
			      RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_PROG_SWAP,
			      RGMII_CONFIG_PROG_SWAP, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG2_DATA_DIVIDE_CLK_SEL,
			      0, RGMII_IO_MACRO_CONFIG2);

		rgmii_updatel(ethqos, RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
			      phase_shift, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG2_RSVD_CONFIG15,
			      0, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG2_RX_PROG_SWAP,
			      RGMII_CONFIG2_RX_PROG_SWAP,
			      RGMII_IO_MACRO_CONFIG2);

		/* Set PRG_RCLK_DLY to 57 for 1.8 ns delay */
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_PRG_RCLK_DLY,
			      57, SDCC_HC_REG_DDR_CONFIG);
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_PRG_DLY_EN,
			      SDCC_DDR_CONFIG_PRG_DLY_EN,
			      SDCC_HC_REG_DDR_CONFIG);
		if (ethqos->rgmii_config_looback_en)
			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
				      RGMII_CONFIG_LOOPBACK_EN, RGMII_IO_MACRO_CONFIG);
		else
			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
				      0, RGMII_IO_MACRO_CONFIG);
		break;

	case SPEED_100:
		rgmii_updatel(ethqos, RGMII_CONFIG_DDR_MODE,
			      RGMII_CONFIG_DDR_MODE, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_BYPASS_TX_ID_EN,
			      RGMII_CONFIG_BYPASS_TX_ID_EN,
			      RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_POS_NEG_DATA_SEL,
			      0, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_PROG_SWAP,
			      0, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG2_DATA_DIVIDE_CLK_SEL,
			      0, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
			      phase_shift, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG_MAX_SPD_PRG_2,
			      BIT(6), RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG2_RSVD_CONFIG15,
			      0, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG2_RX_PROG_SWAP,
			      0, RGMII_IO_MACRO_CONFIG2);
		/* Write 0x5 to PRG_RCLK_DLY_CODE */
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_CODE,
			      (BIT(29) | BIT(27)), SDCC_HC_REG_DDR_CONFIG);
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY,
			      SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY,
			      SDCC_HC_REG_DDR_CONFIG);
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_EN,
			      SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_EN,
			      SDCC_HC_REG_DDR_CONFIG);
		if (ethqos->rgmii_config_looback_en)
			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
				      RGMII_CONFIG_LOOPBACK_EN, RGMII_IO_MACRO_CONFIG);
		else
			rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
				      0, RGMII_IO_MACRO_CONFIG);

		break;

	case SPEED_10:
		rgmii_updatel(ethqos, RGMII_CONFIG_DDR_MODE,
			      RGMII_CONFIG_DDR_MODE, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_BYPASS_TX_ID_EN,
			      RGMII_CONFIG_BYPASS_TX_ID_EN,
			      RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_POS_NEG_DATA_SEL,
			      0, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_PROG_SWAP,
			      0, RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG2_DATA_DIVIDE_CLK_SEL,
			      0, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
			      phase_shift, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG_MAX_SPD_PRG_9,
			      BIT(12) | GENMASK(9, 8),
			      RGMII_IO_MACRO_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG2_RSVD_CONFIG15,
			      0, RGMII_IO_MACRO_CONFIG2);
		rgmii_updatel(ethqos, RGMII_CONFIG2_RX_PROG_SWAP,
			      0, RGMII_IO_MACRO_CONFIG2);
		/* Write 0x5 to PRG_RCLK_DLY_CODE */
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_CODE,
			      (BIT(29) | BIT(27)), SDCC_HC_REG_DDR_CONFIG);
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY,
			      SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY,
			      SDCC_HC_REG_DDR_CONFIG);
		rgmii_updatel(ethqos, SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_EN,
			      SDCC_DDR_CONFIG_EXT_PRG_RCLK_DLY_EN,
			      SDCC_HC_REG_DDR_CONFIG);
		rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
			      RGMII_CONFIG_LOOPBACK_EN, RGMII_IO_MACRO_CONFIG);
		break;
	default:
		dev_err(&ethqos->pdev->dev,
			"Invalid speed %d\n", ethqos->speed);
		return -EINVAL;
	}

	return 0;
}

static int ethqos_configure(struct qcom_ethqos *ethqos)
{
	volatile unsigned int dll_lock;
	unsigned int i, retry = 1000;

	/* Reset to POR values and enable clk */
	for (i = 0; i < ethqos->num_por; i++)
		rgmii_writel(ethqos, ethqos->por[i].value,
			     ethqos->por[i].offset);
	ethqos_set_func_clk_en(ethqos);

	/* Initialize the DLL first */

	/* Set DLL_RST */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_DLL_RST,
		      SDCC_DLL_CONFIG_DLL_RST, SDCC_HC_REG_DLL_CONFIG);

	/* Set PDN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_PDN,
		      SDCC_DLL_CONFIG_PDN, SDCC_HC_REG_DLL_CONFIG);

	/* Clear DLL_RST */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_DLL_RST, 0,
		      SDCC_HC_REG_DLL_CONFIG);

	/* Clear PDN */
	rgmii_updatel(ethqos, SDCC_DLL_CONFIG_PDN, 0,
		      SDCC_HC_REG_DLL_CONFIG);

	if (ethqos->speed != SPEED_100 && ethqos->speed != SPEED_10) {
		/* Set DLL_EN */
		rgmii_updatel(ethqos, SDCC_DLL_CONFIG_DLL_EN,
			      SDCC_DLL_CONFIG_DLL_EN, SDCC_HC_REG_DLL_CONFIG);

		/* Set CK_OUT_EN */
		rgmii_updatel(ethqos, SDCC_DLL_CONFIG_CK_OUT_EN,
			      SDCC_DLL_CONFIG_CK_OUT_EN,
			      SDCC_HC_REG_DLL_CONFIG);

		/* Set USR_CTL bit 26 with mask of 3 bits */
		rgmii_updatel(ethqos, GENMASK(26, 24), BIT(26), SDCC_USR_CTL);

		/* wait for DLL LOCK */
		do {
			mdelay(1);
			dll_lock = rgmii_readl(ethqos, SDC4_STATUS);
			if (dll_lock & SDC4_STATUS_DLL_LOCK)
				break;
			retry--;
		} while (retry > 0);
		if (!retry)
			dev_err(&ethqos->pdev->dev,
				"Timeout while waiting for DLL lock\n");
	}

	if (ethqos->speed == SPEED_1000)
		ethqos_dll_configure(ethqos);

	ethqos_rgmii_macro_init(ethqos);

	return 0;
}

static void ethqos_fix_mac_speed(void *priv, unsigned int speed)
{
	struct qcom_ethqos *ethqos = priv;

	ethqos->speed = speed;
	ethqos_update_rgmii_clk(ethqos, speed);
	ethqos_configure(ethqos);
}

static int ethqos_clks_config(void *priv, bool enabled)
{
	struct qcom_ethqos *ethqos = priv;
	int ret = 0;

	if (enabled) {
		ret = clk_prepare_enable(ethqos->rgmii_clk);
		if (ret) {
			dev_err(&ethqos->pdev->dev, "rgmii_clk enable failed\n");
			return ret;
		}

		/* Enable functional clock to prevent DMA reset to timeout due
		 * to lacking PHY clock after the hardware block has been power
		 * cycled. The actual configuration will be adjusted once
		 * ethqos_fix_mac_speed() is invoked.
		 */
		ethqos_set_func_clk_en(ethqos);
	} else {
		clk_disable_unprepare(ethqos->rgmii_clk);
	}

	return ret;
}

static int qcom_ethqos_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct plat_stmmacenet_data *plat_dat;
	struct stmmac_resources stmmac_res;
	const struct ethqos_emac_driver_data *data;
	struct qcom_ethqos *ethqos;
	int ret;

	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
	if (ret)
		return ret;

	plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
	if (IS_ERR(plat_dat)) {
		dev_err(&pdev->dev, "dt configuration failed\n");
		return PTR_ERR(plat_dat);
	}

	plat_dat->clks_config = ethqos_clks_config;

	ethqos = devm_kzalloc(&pdev->dev, sizeof(*ethqos), GFP_KERNEL);
	if (!ethqos) {
		ret = -ENOMEM;
		goto err_mem;
	}

	ethqos->pdev = pdev;
	ethqos->rgmii_base = devm_platform_ioremap_resource_byname(pdev, "rgmii");
	if (IS_ERR(ethqos->rgmii_base)) {
		ret = PTR_ERR(ethqos->rgmii_base);
		goto err_mem;
	}

	data = of_device_get_match_data(&pdev->dev);
	ethqos->por = data->por;
	ethqos->num_por = data->num_por;
	ethqos->rgmii_config_looback_en = data->rgmii_config_looback_en;

	ethqos->rgmii_clk = devm_clk_get(&pdev->dev, "rgmii");
	if (IS_ERR(ethqos->rgmii_clk)) {
		ret = PTR_ERR(ethqos->rgmii_clk);
		goto err_mem;
	}

	ret = ethqos_clks_config(ethqos, true);
	if (ret)
		goto err_mem;

	ethqos->speed = SPEED_1000;
	ethqos_update_rgmii_clk(ethqos, SPEED_1000);
	ethqos_set_func_clk_en(ethqos);

	plat_dat->bsp_priv = ethqos;
	plat_dat->fix_mac_speed = ethqos_fix_mac_speed;
	plat_dat->dump_debug_regs = rgmii_dump;
	plat_dat->has_gmac4 = 1;
	plat_dat->pmt = 1;
	plat_dat->tso_en = of_property_read_bool(np, "snps,tso");
	if (of_device_is_compatible(np, "qcom,qcs404-ethqos"))
		plat_dat->rx_clk_runs_in_lpi = 1;

	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
	if (ret)
		goto err_clk;

	return ret;

err_clk:
	ethqos_clks_config(ethqos, false);

err_mem:
	stmmac_remove_config_dt(pdev, plat_dat);

	return ret;
}

static int qcom_ethqos_remove(struct platform_device *pdev)
{
	struct qcom_ethqos *ethqos;
	int ret;

	ethqos = get_stmmac_bsp_priv(&pdev->dev);
	if (!ethqos)
		return -ENODEV;

	ret = stmmac_pltfr_remove(pdev);
	ethqos_clks_config(ethqos, false);

	return ret;
}

static const struct of_device_id qcom_ethqos_match[] = {
	{ .compatible = "qcom,qcs404-ethqos", .data = &emac_v2_3_0_data},
	{ .compatible = "qcom,sm8150-ethqos", .data = &emac_v2_1_0_data},
	{ }
};
MODULE_DEVICE_TABLE(of, qcom_ethqos_match);

static struct platform_driver qcom_ethqos_driver = {
	.probe  = qcom_ethqos_probe,
	.remove = qcom_ethqos_remove,
	.driver = {
		.name           = "qcom-ethqos",
		.pm		= &stmmac_pltfr_pm_ops,
		.of_match_table = qcom_ethqos_match,
	},
};
module_platform_driver(qcom_ethqos_driver);

MODULE_DESCRIPTION("Qualcomm ETHQOS driver");
MODULE_LICENSE("GPL v2");