drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c - linux - Git at Google

 // 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;
 };

 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;
 };

 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(struct qcom_ethqos *ethqos)
 {
 	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),
 };

 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)
 {
 	/* 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,
 			      RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
 			      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);
 		rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
 			      RGMII_CONFIG_LOOPBACK_EN, 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,
 			      RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
 			      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);
 		rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
 			      RGMII_CONFIG_LOOPBACK_EN, 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,
 			      0, 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 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;
 	struct resource *res;
 	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);
 	}

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

 	ethqos->pdev = pdev;
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rgmii");
 	ethqos->rgmii_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(ethqos->rgmii_base)) {
 		dev_err(&pdev->dev, "Can't get rgmii base\n");
 		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_clk = devm_clk_get(&pdev->dev, "rgmii");
 	if (IS_ERR(ethqos->rgmii_clk)) {
 		ret = PTR_ERR(ethqos->rgmii_clk);
 		goto err_mem;
 	}

 	ret = clk_prepare_enable(ethqos->rgmii_clk);
 	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->has_gmac4 = 1;
 	plat_dat->pmt = 1;
 	plat_dat->tso_en = of_property_read_bool(np, "snps,tso");

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

 	rgmii_dump(ethqos);

 	return ret;

 err_clk:
 	clk_disable_unprepare(ethqos->rgmii_clk);

 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);
 	clk_disable_unprepare(ethqos->rgmii_clk);

 	return ret;
 }

 static const struct of_device_id qcom_ethqos_match[] = {
 	{ .compatible = "qcom,qcs404-ethqos", .data = &emac_v2_3_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 = of_match_ptr(qcom_ethqos_match),
 	},
 };
 module_platform_driver(qcom_ethqos_driver);

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

	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;
	};

	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(struct qcom_ethqos *ethqos)
	{
	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),
	};

	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)
	{
	/* 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,
	RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
	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);
	rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
	RGMII_CONFIG_LOOPBACK_EN, 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,
	RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
	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);
	rgmii_updatel(ethqos, RGMII_CONFIG_LOOPBACK_EN,
	RGMII_CONFIG_LOOPBACK_EN, 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,
	0, 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 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;
	struct resource *res;
	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);
	}

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

	ethqos->pdev = pdev;
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rgmii");
	ethqos->rgmii_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ethqos->rgmii_base)) {
	dev_err(&pdev->dev, "Can't get rgmii base\n");
	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_clk = devm_clk_get(&pdev->dev, "rgmii");
	if (IS_ERR(ethqos->rgmii_clk)) {
	ret = PTR_ERR(ethqos->rgmii_clk);
	goto err_mem;
	}

	ret = clk_prepare_enable(ethqos->rgmii_clk);
	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->has_gmac4 = 1;
	plat_dat->pmt = 1;
	plat_dat->tso_en = of_property_read_bool(np, "snps,tso");

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

	rgmii_dump(ethqos);

	return ret;

	err_clk:
	clk_disable_unprepare(ethqos->rgmii_clk);

	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);
	clk_disable_unprepare(ethqos->rgmii_clk);

	return ret;
	}

	static const struct of_device_id qcom_ethqos_match[] = {
	{ .compatible = "qcom,qcs404-ethqos", .data = &emac_v2_3_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 = of_match_ptr(qcom_ethqos_match),
	},
	};
	module_platform_driver(qcom_ethqos_driver);

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