drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Synopsys DWC Ethernet Quality-of-Service v4.10a linux driver
  *
  * Copyright (C) 2016 Joao Pinto <jpinto@synopsys.com>
  */

 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/device.h>
 #include <linux/gpio/consumer.h>
 #include <linux/ethtool.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of_net.h>
 #include <linux/mfd/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
 #include <linux/stmmac.h>

 #include "stmmac_platform.h"
 #include "dwmac4.h"

 struct tegra_eqos {
 	struct device *dev;
 	void __iomem *regs;

 	struct reset_control *rst;
 	struct clk *clk_master;
 	struct clk *clk_slave;
 	struct clk *clk_tx;
 	struct clk *clk_rx;

 	struct gpio_desc *reset;
 };

 static int dwc_eth_dwmac_config_dt(struct platform_device *pdev,
 				   struct plat_stmmacenet_data *plat_dat)
 {
 	struct device *dev = &pdev->dev;
 	u32 burst_map = 0;
 	u32 bit_index = 0;
 	u32 a_index = 0;

 	if (!plat_dat->axi) {
 		plat_dat->axi = kzalloc(sizeof(struct stmmac_axi), GFP_KERNEL);

 		if (!plat_dat->axi)
 			return -ENOMEM;
 	}

 	plat_dat->axi->axi_lpi_en = device_property_read_bool(dev,
 							      "snps,en-lpi");
 	if (device_property_read_u32(dev, "snps,write-requests",
 				     &plat_dat->axi->axi_wr_osr_lmt)) {
 		/**
 		 * Since the register has a reset value of 1, if property
 		 * is missing, default to 1.
 		 */
 		plat_dat->axi->axi_wr_osr_lmt = 1;
 	} else {
 		/**
 		 * If property exists, to keep the behavior from dwc_eth_qos,
 		 * subtract one after parsing.
 		 */
 		plat_dat->axi->axi_wr_osr_lmt--;
 	}

 	if (device_property_read_u32(dev, "snps,read-requests",
 				     &plat_dat->axi->axi_rd_osr_lmt)) {
 		/**
 		 * Since the register has a reset value of 1, if property
 		 * is missing, default to 1.
 		 */
 		plat_dat->axi->axi_rd_osr_lmt = 1;
 	} else {
 		/**
 		 * If property exists, to keep the behavior from dwc_eth_qos,
 		 * subtract one after parsing.
 		 */
 		plat_dat->axi->axi_rd_osr_lmt--;
 	}
 	device_property_read_u32(dev, "snps,burst-map", &burst_map);

 	/* converts burst-map bitmask to burst array */
 	for (bit_index = 0; bit_index < 7; bit_index++) {
 		if (burst_map & (1 << bit_index)) {
 			switch (bit_index) {
 			case 0:
 			plat_dat->axi->axi_blen[a_index] = 4; break;
 			case 1:
 			plat_dat->axi->axi_blen[a_index] = 8; break;
 			case 2:
 			plat_dat->axi->axi_blen[a_index] = 16; break;
 			case 3:
 			plat_dat->axi->axi_blen[a_index] = 32; break;
 			case 4:
 			plat_dat->axi->axi_blen[a_index] = 64; break;
 			case 5:
 			plat_dat->axi->axi_blen[a_index] = 128; break;
 			case 6:
 			plat_dat->axi->axi_blen[a_index] = 256; break;
 			default:
 			break;
 			}
 			a_index++;
 		}
 	}

 	/* dwc-qos needs GMAC4, AAL, TSO and PMT */
 	plat_dat->has_gmac4 = 1;
 	plat_dat->dma_cfg->aal = 1;
 	plat_dat->tso_en = 1;
 	plat_dat->pmt = 1;

 	return 0;
 }

 static int dwc_qos_probe(struct platform_device *pdev,
 			 struct plat_stmmacenet_data *plat_dat,
 			 struct stmmac_resources *stmmac_res)
 {
 	int err;

 	plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk");
 	if (IS_ERR(plat_dat->stmmac_clk)) {
 		dev_err(&pdev->dev, "apb_pclk clock not found.\n");
 		return PTR_ERR(plat_dat->stmmac_clk);
 	}

 	err = clk_prepare_enable(plat_dat->stmmac_clk);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to enable apb_pclk clock: %d\n",
 			err);
 		return err;
 	}

 	plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk");
 	if (IS_ERR(plat_dat->pclk)) {
 		dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
 		err = PTR_ERR(plat_dat->pclk);
 		goto disable;
 	}

 	err = clk_prepare_enable(plat_dat->pclk);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to enable phy_ref clock: %d\n",
 			err);
 		goto disable;
 	}

 	return 0;

 disable:
 	clk_disable_unprepare(plat_dat->stmmac_clk);
 	return err;
 }

 static int dwc_qos_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct stmmac_priv *priv = netdev_priv(ndev);

 	clk_disable_unprepare(priv->plat->pclk);
 	clk_disable_unprepare(priv->plat->stmmac_clk);

 	return 0;
 }

 #define SDMEMCOMPPADCTRL 0x8800
 #define  SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD BIT(31)

 #define AUTO_CAL_CONFIG 0x8804
 #define  AUTO_CAL_CONFIG_START BIT(31)
 #define  AUTO_CAL_CONFIG_ENABLE BIT(29)

 #define AUTO_CAL_STATUS 0x880c
 #define  AUTO_CAL_STATUS_ACTIVE BIT(31)

 static void tegra_eqos_fix_speed(void *priv, unsigned int speed)
 {
 	struct tegra_eqos *eqos = priv;
 	unsigned long rate = 125000000;
 	bool needs_calibration = false;
 	u32 value;
 	int err;

 	switch (speed) {
 	case SPEED_1000:
 		needs_calibration = true;
 		rate = 125000000;
 		break;

 	case SPEED_100:
 		needs_calibration = true;
 		rate = 25000000;
 		break;

 	case SPEED_10:
 		rate = 2500000;
 		break;

 	default:
 		dev_err(eqos->dev, "invalid speed %u\n", speed);
 		break;
 	}

 	if (needs_calibration) {
 		/* calibrate */
 		value = readl(eqos->regs + SDMEMCOMPPADCTRL);
 		value |= SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
 		writel(value, eqos->regs + SDMEMCOMPPADCTRL);

 		udelay(1);

 		value = readl(eqos->regs + AUTO_CAL_CONFIG);
 		value |= AUTO_CAL_CONFIG_START | AUTO_CAL_CONFIG_ENABLE;
 		writel(value, eqos->regs + AUTO_CAL_CONFIG);

 		err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS,
 						value,
 						value & AUTO_CAL_STATUS_ACTIVE,
 						1, 10);
 		if (err < 0) {
 			dev_err(eqos->dev, "calibration did not start\n");
 			goto failed;
 		}

 		err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS,
 						value,
 						(value & AUTO_CAL_STATUS_ACTIVE) == 0,
 						20, 200);
 		if (err < 0) {
 			dev_err(eqos->dev, "calibration didn't finish\n");
 			goto failed;
 		}

 	failed:
 		value = readl(eqos->regs + SDMEMCOMPPADCTRL);
 		value &= ~SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
 		writel(value, eqos->regs + SDMEMCOMPPADCTRL);
 	} else {
 		value = readl(eqos->regs + AUTO_CAL_CONFIG);
 		value &= ~AUTO_CAL_CONFIG_ENABLE;
 		writel(value, eqos->regs + AUTO_CAL_CONFIG);
 	}

 	err = clk_set_rate(eqos->clk_tx, rate);
 	if (err < 0)
 		dev_err(eqos->dev, "failed to set TX rate: %d\n", err);
 }

 static int tegra_eqos_init(struct platform_device *pdev, void *priv)
 {
 	struct tegra_eqos *eqos = priv;
 	unsigned long rate;
 	u32 value;

 	rate = clk_get_rate(eqos->clk_slave);

 	value = (rate / 1000000) - 1;
 	writel(value, eqos->regs + GMAC_1US_TIC_COUNTER);

 	return 0;
 }

 static int tegra_eqos_probe(struct platform_device *pdev,
 			    struct plat_stmmacenet_data *data,
 			    struct stmmac_resources *res)
 {
 	struct device *dev = &pdev->dev;
 	struct tegra_eqos *eqos;
 	int err;

 	eqos = devm_kzalloc(&pdev->dev, sizeof(*eqos), GFP_KERNEL);
 	if (!eqos)
 		return -ENOMEM;

 	eqos->dev = &pdev->dev;
 	eqos->regs = res->addr;

 	if (!is_of_node(dev->fwnode))
 		goto bypass_clk_reset_gpio;

 	eqos->clk_master = devm_clk_get(&pdev->dev, "master_bus");
 	if (IS_ERR(eqos->clk_master)) {
 		err = PTR_ERR(eqos->clk_master);
 		goto error;
 	}

 	err = clk_prepare_enable(eqos->clk_master);
 	if (err < 0)
 		goto error;

 	eqos->clk_slave = devm_clk_get(&pdev->dev, "slave_bus");
 	if (IS_ERR(eqos->clk_slave)) {
 		err = PTR_ERR(eqos->clk_slave);
 		goto disable_master;
 	}

 	data->stmmac_clk = eqos->clk_slave;

 	err = clk_prepare_enable(eqos->clk_slave);
 	if (err < 0)
 		goto disable_master;

 	eqos->clk_rx = devm_clk_get(&pdev->dev, "rx");
 	if (IS_ERR(eqos->clk_rx)) {
 		err = PTR_ERR(eqos->clk_rx);
 		goto disable_slave;
 	}

 	err = clk_prepare_enable(eqos->clk_rx);
 	if (err < 0)
 		goto disable_slave;

 	eqos->clk_tx = devm_clk_get(&pdev->dev, "tx");
 	if (IS_ERR(eqos->clk_tx)) {
 		err = PTR_ERR(eqos->clk_tx);
 		goto disable_rx;
 	}

 	err = clk_prepare_enable(eqos->clk_tx);
 	if (err < 0)
 		goto disable_rx;

 	eqos->reset = devm_gpiod_get(&pdev->dev, "phy-reset", GPIOD_OUT_HIGH);
 	if (IS_ERR(eqos->reset)) {
 		err = PTR_ERR(eqos->reset);
 		goto disable_tx;
 	}

 	usleep_range(2000, 4000);
 	gpiod_set_value(eqos->reset, 0);

 	/* MDIO bus was already reset just above */
 	data->mdio_bus_data->needs_reset = false;

 	eqos->rst = devm_reset_control_get(&pdev->dev, "eqos");
 	if (IS_ERR(eqos->rst)) {
 		err = PTR_ERR(eqos->rst);
 		goto reset_phy;
 	}

 	err = reset_control_assert(eqos->rst);
 	if (err < 0)
 		goto reset_phy;

 	usleep_range(2000, 4000);

 	err = reset_control_deassert(eqos->rst);
 	if (err < 0)
 		goto reset_phy;

 	usleep_range(2000, 4000);

 bypass_clk_reset_gpio:
 	data->fix_mac_speed = tegra_eqos_fix_speed;
 	data->init = tegra_eqos_init;
 	data->bsp_priv = eqos;
 	data->sph_disable = 1;

 	err = tegra_eqos_init(pdev, eqos);
 	if (err < 0)
 		goto reset;

 	return 0;
 reset:
 	reset_control_assert(eqos->rst);
 reset_phy:
 	gpiod_set_value(eqos->reset, 1);
 disable_tx:
 	clk_disable_unprepare(eqos->clk_tx);
 disable_rx:
 	clk_disable_unprepare(eqos->clk_rx);
 disable_slave:
 	clk_disable_unprepare(eqos->clk_slave);
 disable_master:
 	clk_disable_unprepare(eqos->clk_master);
 error:
 	return err;
 }

 static int tegra_eqos_remove(struct platform_device *pdev)
 {
 	struct tegra_eqos *eqos = get_stmmac_bsp_priv(&pdev->dev);

 	reset_control_assert(eqos->rst);
 	gpiod_set_value(eqos->reset, 1);
 	clk_disable_unprepare(eqos->clk_tx);
 	clk_disable_unprepare(eqos->clk_rx);
 	clk_disable_unprepare(eqos->clk_slave);
 	clk_disable_unprepare(eqos->clk_master);

 	return 0;
 }

 struct dwc_eth_dwmac_data {
 	int (*probe)(struct platform_device *pdev,
 		     struct plat_stmmacenet_data *data,
 		     struct stmmac_resources *res);
 	int (*remove)(struct platform_device *pdev);
 };

 static const struct dwc_eth_dwmac_data dwc_qos_data = {
 	.probe = dwc_qos_probe,
 	.remove = dwc_qos_remove,
 };

 static const struct dwc_eth_dwmac_data tegra_eqos_data = {
 	.probe = tegra_eqos_probe,
 	.remove = tegra_eqos_remove,
 };

 static int dwc_eth_dwmac_probe(struct platform_device *pdev)
 {
 	const struct dwc_eth_dwmac_data *data;
 	struct plat_stmmacenet_data *plat_dat;
 	struct stmmac_resources stmmac_res;
 	int ret;

 	data = device_get_match_data(&pdev->dev);

 	memset(&stmmac_res, 0, sizeof(struct stmmac_resources));

 	/**
 	 * Since stmmac_platform supports name IRQ only, basic platform
 	 * resource initialization is done in the glue logic.
 	 */
 	stmmac_res.irq = platform_get_irq(pdev, 0);
 	if (stmmac_res.irq < 0)
 		return stmmac_res.irq;
 	stmmac_res.wol_irq = stmmac_res.irq;

 	stmmac_res.addr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(stmmac_res.addr))
 		return PTR_ERR(stmmac_res.addr);

 	plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
 	if (IS_ERR(plat_dat))
 		return PTR_ERR(plat_dat);

 	ret = data->probe(pdev, plat_dat, &stmmac_res);
 	if (ret < 0) {
 		if (ret != -EPROBE_DEFER)
 			dev_err(&pdev->dev, "failed to probe subdriver: %d\n",
 				ret);

 		goto remove_config;
 	}

 	ret = dwc_eth_dwmac_config_dt(pdev, plat_dat);
 	if (ret)
 		goto remove;

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

 	return ret;

 remove:
 	data->remove(pdev);
 remove_config:
 	stmmac_remove_config_dt(pdev, plat_dat);

 	return ret;
 }

 static int dwc_eth_dwmac_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	const struct dwc_eth_dwmac_data *data;
 	int err;

 	data = device_get_match_data(&pdev->dev);

 	err = stmmac_dvr_remove(&pdev->dev);
 	if (err < 0)
 		dev_err(&pdev->dev, "failed to remove platform: %d\n", err);

 	err = data->remove(pdev);
 	if (err < 0)
 		dev_err(&pdev->dev, "failed to remove subdriver: %d\n", err);

 	stmmac_remove_config_dt(pdev, priv->plat);

 	return err;
 }

 static const struct of_device_id dwc_eth_dwmac_match[] = {
 	{ .compatible = "snps,dwc-qos-ethernet-4.10", .data = &dwc_qos_data },
 	{ .compatible = "nvidia,tegra186-eqos", .data = &tegra_eqos_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, dwc_eth_dwmac_match);

 static struct platform_driver dwc_eth_dwmac_driver = {
 	.probe  = dwc_eth_dwmac_probe,
 	.remove = dwc_eth_dwmac_remove,
 	.driver = {
 		.name           = "dwc-eth-dwmac",
 		.pm             = &stmmac_pltfr_pm_ops,
 		.of_match_table = dwc_eth_dwmac_match,
 	},
 };
 module_platform_driver(dwc_eth_dwmac_driver);

 MODULE_AUTHOR("Joao Pinto <jpinto@synopsys.com>");
 MODULE_DESCRIPTION("Synopsys DWC Ethernet Quality-of-Service v4.10a driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Synopsys DWC Ethernet Quality-of-Service v4.10a linux driver
	*
	* Copyright (C) 2016 Joao Pinto <jpinto@synopsys.com>
	*/

	#include <linux/clk.h>
	#include <linux/clk-provider.h>
	#include <linux/device.h>
	#include <linux/gpio/consumer.h>
	#include <linux/ethtool.h>
	#include <linux/io.h>
	#include <linux/iopoll.h>
	#include <linux/ioport.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/of_net.h>
	#include <linux/mfd/syscon.h>
	#include <linux/platform_device.h>
	#include <linux/reset.h>
	#include <linux/stmmac.h>

	#include "stmmac_platform.h"
	#include "dwmac4.h"

	struct tegra_eqos {
	struct device *dev;
	void __iomem *regs;

	struct reset_control *rst;
	struct clk *clk_master;
	struct clk *clk_slave;
	struct clk *clk_tx;
	struct clk *clk_rx;

	struct gpio_desc *reset;
	};

	static int dwc_eth_dwmac_config_dt(struct platform_device *pdev,
	struct plat_stmmacenet_data *plat_dat)
	{
	struct device *dev = &pdev->dev;
	u32 burst_map = 0;
	u32 bit_index = 0;
	u32 a_index = 0;

	if (!plat_dat->axi) {
	plat_dat->axi = kzalloc(sizeof(struct stmmac_axi), GFP_KERNEL);

	if (!plat_dat->axi)
	return -ENOMEM;
	}

	plat_dat->axi->axi_lpi_en = device_property_read_bool(dev,
	"snps,en-lpi");
	if (device_property_read_u32(dev, "snps,write-requests",
	&plat_dat->axi->axi_wr_osr_lmt)) {
	/**
	* Since the register has a reset value of 1, if property
	* is missing, default to 1.
	*/
	plat_dat->axi->axi_wr_osr_lmt = 1;
	} else {
	/**
	* If property exists, to keep the behavior from dwc_eth_qos,
	* subtract one after parsing.
	*/
	plat_dat->axi->axi_wr_osr_lmt--;
	}

	if (device_property_read_u32(dev, "snps,read-requests",
	&plat_dat->axi->axi_rd_osr_lmt)) {
	/**
	* Since the register has a reset value of 1, if property
	* is missing, default to 1.
	*/
	plat_dat->axi->axi_rd_osr_lmt = 1;
	} else {
	/**
	* If property exists, to keep the behavior from dwc_eth_qos,
	* subtract one after parsing.
	*/
	plat_dat->axi->axi_rd_osr_lmt--;
	}
	device_property_read_u32(dev, "snps,burst-map", &burst_map);

	/* converts burst-map bitmask to burst array */
	for (bit_index = 0; bit_index < 7; bit_index++) {
	if (burst_map & (1 << bit_index)) {
	switch (bit_index) {
	case 0:
	plat_dat->axi->axi_blen[a_index] = 4; break;
	case 1:
	plat_dat->axi->axi_blen[a_index] = 8; break;
	case 2:
	plat_dat->axi->axi_blen[a_index] = 16; break;
	case 3:
	plat_dat->axi->axi_blen[a_index] = 32; break;
	case 4:
	plat_dat->axi->axi_blen[a_index] = 64; break;
	case 5:
	plat_dat->axi->axi_blen[a_index] = 128; break;
	case 6:
	plat_dat->axi->axi_blen[a_index] = 256; break;
	default:
	break;
	}
	a_index++;
	}
	}

	/* dwc-qos needs GMAC4, AAL, TSO and PMT */
	plat_dat->has_gmac4 = 1;
	plat_dat->dma_cfg->aal = 1;
	plat_dat->tso_en = 1;
	plat_dat->pmt = 1;

	return 0;
	}

	static int dwc_qos_probe(struct platform_device *pdev,
	struct plat_stmmacenet_data *plat_dat,
	struct stmmac_resources *stmmac_res)
	{
	int err;

	plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk");
	if (IS_ERR(plat_dat->stmmac_clk)) {
	dev_err(&pdev->dev, "apb_pclk clock not found.\n");
	return PTR_ERR(plat_dat->stmmac_clk);
	}

	err = clk_prepare_enable(plat_dat->stmmac_clk);
	if (err < 0) {
	dev_err(&pdev->dev, "failed to enable apb_pclk clock: %d\n",
	err);
	return err;
	}

	plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk");
	if (IS_ERR(plat_dat->pclk)) {
	dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
	err = PTR_ERR(plat_dat->pclk);
	goto disable;
	}

	err = clk_prepare_enable(plat_dat->pclk);
	if (err < 0) {
	dev_err(&pdev->dev, "failed to enable phy_ref clock: %d\n",
	err);
	goto disable;
	}

	return 0;

	disable:
	clk_disable_unprepare(plat_dat->stmmac_clk);
	return err;
	}

	static int dwc_qos_remove(struct platform_device *pdev)
	{
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct stmmac_priv *priv = netdev_priv(ndev);

	clk_disable_unprepare(priv->plat->pclk);
	clk_disable_unprepare(priv->plat->stmmac_clk);

	return 0;
	}

	#define SDMEMCOMPPADCTRL 0x8800
	#define SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD BIT(31)

	#define AUTO_CAL_CONFIG 0x8804
	#define AUTO_CAL_CONFIG_START BIT(31)
	#define AUTO_CAL_CONFIG_ENABLE BIT(29)

	#define AUTO_CAL_STATUS 0x880c
	#define AUTO_CAL_STATUS_ACTIVE BIT(31)

	static void tegra_eqos_fix_speed(void *priv, unsigned int speed)
	{
	struct tegra_eqos *eqos = priv;
	unsigned long rate = 125000000;
	bool needs_calibration = false;
	u32 value;
	int err;

	switch (speed) {
	case SPEED_1000:
	needs_calibration = true;
	rate = 125000000;
	break;

	case SPEED_100:
	needs_calibration = true;
	rate = 25000000;
	break;

	case SPEED_10:
	rate = 2500000;
	break;

	default:
	dev_err(eqos->dev, "invalid speed %u\n", speed);
	break;
	}

	if (needs_calibration) {
	/* calibrate */
	value = readl(eqos->regs + SDMEMCOMPPADCTRL);
	value \|= SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
	writel(value, eqos->regs + SDMEMCOMPPADCTRL);

	udelay(1);

	value = readl(eqos->regs + AUTO_CAL_CONFIG);
	value \|= AUTO_CAL_CONFIG_START \| AUTO_CAL_CONFIG_ENABLE;
	writel(value, eqos->regs + AUTO_CAL_CONFIG);

	err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS,
	value,
	value & AUTO_CAL_STATUS_ACTIVE,
	1, 10);
	if (err < 0) {
	dev_err(eqos->dev, "calibration did not start\n");
	goto failed;
	}

	err = readl_poll_timeout_atomic(eqos->regs + AUTO_CAL_STATUS,
	value,
	(value & AUTO_CAL_STATUS_ACTIVE) == 0,
	20, 200);
	if (err < 0) {
	dev_err(eqos->dev, "calibration didn't finish\n");
	goto failed;
	}

	failed:
	value = readl(eqos->regs + SDMEMCOMPPADCTRL);
	value &= ~SDMEMCOMPPADCTRL_PAD_E_INPUT_OR_E_PWRD;
	writel(value, eqos->regs + SDMEMCOMPPADCTRL);
	} else {
	value = readl(eqos->regs + AUTO_CAL_CONFIG);
	value &= ~AUTO_CAL_CONFIG_ENABLE;
	writel(value, eqos->regs + AUTO_CAL_CONFIG);
	}

	err = clk_set_rate(eqos->clk_tx, rate);
	if (err < 0)
	dev_err(eqos->dev, "failed to set TX rate: %d\n", err);
	}

	static int tegra_eqos_init(struct platform_device pdev, void priv)
	{
	struct tegra_eqos *eqos = priv;
	unsigned long rate;
	u32 value;

	rate = clk_get_rate(eqos->clk_slave);

	value = (rate / 1000000) - 1;
	writel(value, eqos->regs + GMAC_1US_TIC_COUNTER);

	return 0;
	}

	static int tegra_eqos_probe(struct platform_device *pdev,
	struct plat_stmmacenet_data *data,
	struct stmmac_resources *res)
	{
	struct device *dev = &pdev->dev;
	struct tegra_eqos *eqos;
	int err;

	eqos = devm_kzalloc(&pdev->dev, sizeof(*eqos), GFP_KERNEL);
	if (!eqos)
	return -ENOMEM;

	eqos->dev = &pdev->dev;
	eqos->regs = res->addr;

	if (!is_of_node(dev->fwnode))
	goto bypass_clk_reset_gpio;

	eqos->clk_master = devm_clk_get(&pdev->dev, "master_bus");
	if (IS_ERR(eqos->clk_master)) {
	err = PTR_ERR(eqos->clk_master);
	goto error;
	}

	err = clk_prepare_enable(eqos->clk_master);
	if (err < 0)
	goto error;

	eqos->clk_slave = devm_clk_get(&pdev->dev, "slave_bus");
	if (IS_ERR(eqos->clk_slave)) {
	err = PTR_ERR(eqos->clk_slave);
	goto disable_master;
	}

	data->stmmac_clk = eqos->clk_slave;

	err = clk_prepare_enable(eqos->clk_slave);
	if (err < 0)
	goto disable_master;

	eqos->clk_rx = devm_clk_get(&pdev->dev, "rx");
	if (IS_ERR(eqos->clk_rx)) {
	err = PTR_ERR(eqos->clk_rx);
	goto disable_slave;
	}

	err = clk_prepare_enable(eqos->clk_rx);
	if (err < 0)
	goto disable_slave;

	eqos->clk_tx = devm_clk_get(&pdev->dev, "tx");
	if (IS_ERR(eqos->clk_tx)) {
	err = PTR_ERR(eqos->clk_tx);
	goto disable_rx;
	}

	err = clk_prepare_enable(eqos->clk_tx);
	if (err < 0)
	goto disable_rx;

	eqos->reset = devm_gpiod_get(&pdev->dev, "phy-reset", GPIOD_OUT_HIGH);
	if (IS_ERR(eqos->reset)) {
	err = PTR_ERR(eqos->reset);
	goto disable_tx;
	}

	usleep_range(2000, 4000);
	gpiod_set_value(eqos->reset, 0);

	/* MDIO bus was already reset just above */
	data->mdio_bus_data->needs_reset = false;

	eqos->rst = devm_reset_control_get(&pdev->dev, "eqos");
	if (IS_ERR(eqos->rst)) {
	err = PTR_ERR(eqos->rst);
	goto reset_phy;
	}

	err = reset_control_assert(eqos->rst);
	if (err < 0)
	goto reset_phy;

	usleep_range(2000, 4000);

	err = reset_control_deassert(eqos->rst);
	if (err < 0)
	goto reset_phy;

	usleep_range(2000, 4000);

	bypass_clk_reset_gpio:
	data->fix_mac_speed = tegra_eqos_fix_speed;
	data->init = tegra_eqos_init;
	data->bsp_priv = eqos;
	data->sph_disable = 1;

	err = tegra_eqos_init(pdev, eqos);
	if (err < 0)
	goto reset;

	return 0;
	reset:
	reset_control_assert(eqos->rst);
	reset_phy:
	gpiod_set_value(eqos->reset, 1);
	disable_tx:
	clk_disable_unprepare(eqos->clk_tx);
	disable_rx:
	clk_disable_unprepare(eqos->clk_rx);
	disable_slave:
	clk_disable_unprepare(eqos->clk_slave);
	disable_master:
	clk_disable_unprepare(eqos->clk_master);
	error:
	return err;
	}

	static int tegra_eqos_remove(struct platform_device *pdev)
	{
	struct tegra_eqos *eqos = get_stmmac_bsp_priv(&pdev->dev);

	reset_control_assert(eqos->rst);
	gpiod_set_value(eqos->reset, 1);
	clk_disable_unprepare(eqos->clk_tx);
	clk_disable_unprepare(eqos->clk_rx);
	clk_disable_unprepare(eqos->clk_slave);
	clk_disable_unprepare(eqos->clk_master);

	return 0;
	}

	struct dwc_eth_dwmac_data {
	int (probe)(struct platform_device pdev,
	struct plat_stmmacenet_data *data,
	struct stmmac_resources *res);
	int (remove)(struct platform_device pdev);
	};

	static const struct dwc_eth_dwmac_data dwc_qos_data = {
	.probe = dwc_qos_probe,
	.remove = dwc_qos_remove,
	};

	static const struct dwc_eth_dwmac_data tegra_eqos_data = {
	.probe = tegra_eqos_probe,
	.remove = tegra_eqos_remove,
	};

	static int dwc_eth_dwmac_probe(struct platform_device *pdev)
	{
	const struct dwc_eth_dwmac_data *data;
	struct plat_stmmacenet_data *plat_dat;
	struct stmmac_resources stmmac_res;
	int ret;

	data = device_get_match_data(&pdev->dev);

	memset(&stmmac_res, 0, sizeof(struct stmmac_resources));

	/**
	* Since stmmac_platform supports name IRQ only, basic platform
	* resource initialization is done in the glue logic.
	*/
	stmmac_res.irq = platform_get_irq(pdev, 0);
	if (stmmac_res.irq < 0)
	return stmmac_res.irq;
	stmmac_res.wol_irq = stmmac_res.irq;

	stmmac_res.addr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(stmmac_res.addr))
	return PTR_ERR(stmmac_res.addr);

	plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
	if (IS_ERR(plat_dat))
	return PTR_ERR(plat_dat);

	ret = data->probe(pdev, plat_dat, &stmmac_res);
	if (ret < 0) {
	if (ret != -EPROBE_DEFER)
	dev_err(&pdev->dev, "failed to probe subdriver: %d\n",
	ret);

	goto remove_config;
	}

	ret = dwc_eth_dwmac_config_dt(pdev, plat_dat);
	if (ret)
	goto remove;

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

	return ret;

	remove:
	data->remove(pdev);
	remove_config:
	stmmac_remove_config_dt(pdev, plat_dat);

	return ret;
	}

	static int dwc_eth_dwmac_remove(struct platform_device *pdev)
	{
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct stmmac_priv *priv = netdev_priv(ndev);
	const struct dwc_eth_dwmac_data *data;
	int err;

	data = device_get_match_data(&pdev->dev);

	err = stmmac_dvr_remove(&pdev->dev);
	if (err < 0)
	dev_err(&pdev->dev, "failed to remove platform: %d\n", err);

	err = data->remove(pdev);
	if (err < 0)
	dev_err(&pdev->dev, "failed to remove subdriver: %d\n", err);

	stmmac_remove_config_dt(pdev, priv->plat);

	return err;
	}

	static const struct of_device_id dwc_eth_dwmac_match[] = {
	{ .compatible = "snps,dwc-qos-ethernet-4.10", .data = &dwc_qos_data },
	{ .compatible = "nvidia,tegra186-eqos", .data = &tegra_eqos_data },
	{ }
	};
	MODULE_DEVICE_TABLE(of, dwc_eth_dwmac_match);

	static struct platform_driver dwc_eth_dwmac_driver = {
	.probe = dwc_eth_dwmac_probe,
	.remove = dwc_eth_dwmac_remove,
	.driver = {
	.name = "dwc-eth-dwmac",
	.pm = &stmmac_pltfr_pm_ops,
	.of_match_table = dwc_eth_dwmac_match,
	},
	};
	module_platform_driver(dwc_eth_dwmac_driver);

	MODULE_AUTHOR("Joao Pinto <jpinto@synopsys.com>");
	MODULE_DESCRIPTION("Synopsys DWC Ethernet Quality-of-Service v4.10a driver");
	MODULE_LICENSE("GPL v2");