drivers/phy/hisilicon/phy-histb-combphy.c - third_party/linux - Git at Google

 /*
  * COMBPHY driver for HiSilicon STB SoCs
  *
  * Copyright (C) 2016-2017 HiSilicon Co., Ltd. http://www.hisilicon.com
  *
  * Authors: Jianguo Sun <sunjianguo1@huawei.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/phy/phy.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <dt-bindings/phy/phy.h>

 #define COMBPHY_MODE_PCIE		0
 #define COMBPHY_MODE_USB3		1
 #define COMBPHY_MODE_SATA		2

 #define COMBPHY_CFG_REG			0x0
 #define COMBPHY_BYPASS_CODEC		BIT(31)
 #define COMBPHY_TEST_WRITE		BIT(24)
 #define COMBPHY_TEST_DATA_SHIFT		20
 #define COMBPHY_TEST_DATA_MASK		GENMASK(23, 20)
 #define COMBPHY_TEST_ADDR_SHIFT		12
 #define COMBPHY_TEST_ADDR_MASK		GENMASK(16, 12)
 #define COMBPHY_CLKREF_OUT_OEN		BIT(0)

 struct histb_combphy_mode {
 	int fixed;
 	int select;
 	u32 reg;
 	u32 shift;
 	u32 mask;
 };

 struct histb_combphy_priv {
 	void __iomem *mmio;
 	struct regmap *syscon;
 	struct reset_control *por_rst;
 	struct clk *ref_clk;
 	struct phy *phy;
 	struct histb_combphy_mode mode;
 };

 static void nano_register_write(struct histb_combphy_priv *priv,
 				u32 addr, u32 data)
 {
 	void __iomem *reg = priv->mmio + COMBPHY_CFG_REG;
 	u32 val;

 	/* Set up address and data for the write */
 	val = readl(reg);
 	val &= ~COMBPHY_TEST_ADDR_MASK;
 	val |= addr << COMBPHY_TEST_ADDR_SHIFT;
 	val &= ~COMBPHY_TEST_DATA_MASK;
 	val |= data << COMBPHY_TEST_DATA_SHIFT;
 	writel(val, reg);

 	/* Flip strobe control to trigger the write */
 	val &= ~COMBPHY_TEST_WRITE;
 	writel(val, reg);
 	val |= COMBPHY_TEST_WRITE;
 	writel(val, reg);
 }

 static int is_mode_fixed(struct histb_combphy_mode *mode)
 {
 	return (mode->fixed != PHY_NONE) ? true : false;
 }

 static int histb_combphy_set_mode(struct histb_combphy_priv *priv)
 {
 	struct histb_combphy_mode *mode = &priv->mode;
 	struct regmap *syscon = priv->syscon;
 	u32 hw_sel;

 	if (is_mode_fixed(mode))
 		return 0;

 	switch (mode->select) {
 	case PHY_TYPE_SATA:
 		hw_sel = COMBPHY_MODE_SATA;
 		break;
 	case PHY_TYPE_PCIE:
 		hw_sel = COMBPHY_MODE_PCIE;
 		break;
 	case PHY_TYPE_USB3:
 		hw_sel = COMBPHY_MODE_USB3;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return regmap_update_bits(syscon, mode->reg, mode->mask,
 				  hw_sel << mode->shift);
 }

 static int histb_combphy_init(struct phy *phy)
 {
 	struct histb_combphy_priv *priv = phy_get_drvdata(phy);
 	u32 val;
 	int ret;

 	ret = histb_combphy_set_mode(priv);
 	if (ret)
 		return ret;

 	/* Clear bypass bit to enable encoding/decoding */
 	val = readl(priv->mmio + COMBPHY_CFG_REG);
 	val &= ~COMBPHY_BYPASS_CODEC;
 	writel(val, priv->mmio + COMBPHY_CFG_REG);

 	ret = clk_prepare_enable(priv->ref_clk);
 	if (ret)
 		return ret;

 	reset_control_deassert(priv->por_rst);

 	/* Enable EP clock */
 	val = readl(priv->mmio + COMBPHY_CFG_REG);
 	val |= COMBPHY_CLKREF_OUT_OEN;
 	writel(val, priv->mmio + COMBPHY_CFG_REG);

 	/* Need to wait for EP clock stable */
 	mdelay(5);

 	/* Configure nano phy registers as suggested by vendor */
 	nano_register_write(priv, 0x1, 0x8);
 	nano_register_write(priv, 0xc, 0x9);
 	nano_register_write(priv, 0x1a, 0x4);

 	return 0;
 }

 static int histb_combphy_exit(struct phy *phy)
 {
 	struct histb_combphy_priv *priv = phy_get_drvdata(phy);
 	u32 val;

 	/* Disable EP clock */
 	val = readl(priv->mmio + COMBPHY_CFG_REG);
 	val &= ~COMBPHY_CLKREF_OUT_OEN;
 	writel(val, priv->mmio + COMBPHY_CFG_REG);

 	reset_control_assert(priv->por_rst);
 	clk_disable_unprepare(priv->ref_clk);

 	return 0;
 }

 static const struct phy_ops histb_combphy_ops = {
 	.init = histb_combphy_init,
 	.exit = histb_combphy_exit,
 	.owner = THIS_MODULE,
 };

 static struct phy *histb_combphy_xlate(struct device *dev,
 				       struct of_phandle_args *args)
 {
 	struct histb_combphy_priv *priv = dev_get_drvdata(dev);
 	struct histb_combphy_mode *mode = &priv->mode;

 	if (args->args_count < 1) {
 		dev_err(dev, "invalid number of arguments\n");
 		return ERR_PTR(-EINVAL);
 	}

 	mode->select = args->args[0];

 	if (mode->select < PHY_TYPE_SATA || mode->select > PHY_TYPE_USB3) {
 		dev_err(dev, "invalid phy mode select argument\n");
 		return ERR_PTR(-EINVAL);
 	}

 	if (is_mode_fixed(mode) && mode->select != mode->fixed) {
 		dev_err(dev, "mode select %d mismatch fixed phy mode %d\n",
 			mode->select, mode->fixed);
 		return ERR_PTR(-EINVAL);
 	}

 	return priv->phy;
 }

 static int histb_combphy_probe(struct platform_device *pdev)
 {
 	struct phy_provider *phy_provider;
 	struct device *dev = &pdev->dev;
 	struct histb_combphy_priv *priv;
 	struct device_node *np = dev->of_node;
 	struct histb_combphy_mode *mode;
 	struct resource *res;
 	u32 vals[3];
 	int ret;

 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->mmio = devm_ioremap_resource(dev, res);
 	if (IS_ERR(priv->mmio)) {
 		ret = PTR_ERR(priv->mmio);
 		return ret;
 	}

 	priv->syscon = syscon_node_to_regmap(np->parent);
 	if (IS_ERR(priv->syscon)) {
 		dev_err(dev, "failed to find peri_ctrl syscon regmap\n");
 		return PTR_ERR(priv->syscon);
 	}

 	mode = &priv->mode;
 	mode->fixed = PHY_NONE;

 	ret = of_property_read_u32(np, "hisilicon,fixed-mode", &mode->fixed);
 	if (ret == 0)
 		dev_dbg(dev, "found fixed phy mode %d\n", mode->fixed);

 	ret = of_property_read_u32_array(np, "hisilicon,mode-select-bits",
 					 vals, ARRAY_SIZE(vals));
 	if (ret == 0) {
 		if (is_mode_fixed(mode)) {
 			dev_err(dev, "found select bits for fixed mode phy\n");
 			return -EINVAL;
 		}

 		mode->reg = vals[0];
 		mode->shift = vals[1];
 		mode->mask = vals[2];
 		dev_dbg(dev, "found mode select bits\n");
 	} else {
 		if (!is_mode_fixed(mode)) {
 			dev_err(dev, "no valid select bits found for non-fixed phy\n");
 			return -ENODEV;
 		}
 	}

 	priv->ref_clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(priv->ref_clk)) {
 		dev_err(dev, "failed to find ref clock\n");
 		return PTR_ERR(priv->ref_clk);
 	}

 	priv->por_rst = devm_reset_control_get(dev, NULL);
 	if (IS_ERR(priv->por_rst)) {
 		dev_err(dev, "failed to get poweron reset\n");
 		return PTR_ERR(priv->por_rst);
 	}

 	priv->phy = devm_phy_create(dev, NULL, &histb_combphy_ops);
 	if (IS_ERR(priv->phy)) {
 		dev_err(dev, "failed to create combphy\n");
 		return PTR_ERR(priv->phy);
 	}

 	dev_set_drvdata(dev, priv);
 	phy_set_drvdata(priv->phy, priv);

 	phy_provider = devm_of_phy_provider_register(dev, histb_combphy_xlate);
 	return PTR_ERR_OR_ZERO(phy_provider);
 }

 static const struct of_device_id histb_combphy_of_match[] = {
 	{ .compatible = "hisilicon,hi3798cv200-combphy" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, histb_combphy_of_match);

 static struct platform_driver histb_combphy_driver = {
 	.probe	= histb_combphy_probe,
 	.driver = {
 		.name = "combphy",
 		.of_match_table = histb_combphy_of_match,
 	},
 };
 module_platform_driver(histb_combphy_driver);

 MODULE_DESCRIPTION("HiSilicon STB COMBPHY driver");
 MODULE_LICENSE("GPL v2");
	/*
	* COMBPHY driver for HiSilicon STB SoCs
	*
	* Copyright (C) 2016-2017 HiSilicon Co., Ltd. http://www.hisilicon.com
	*
	* Authors: Jianguo Sun <sunjianguo1@huawei.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/mfd/syscon.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/phy/phy.h>
	#include <linux/regmap.h>
	#include <linux/reset.h>
	#include <dt-bindings/phy/phy.h>

	#define COMBPHY_MODE_PCIE 0
	#define COMBPHY_MODE_USB3 1
	#define COMBPHY_MODE_SATA 2

	#define COMBPHY_CFG_REG 0x0
	#define COMBPHY_BYPASS_CODEC BIT(31)
	#define COMBPHY_TEST_WRITE BIT(24)
	#define COMBPHY_TEST_DATA_SHIFT 20
	#define COMBPHY_TEST_DATA_MASK GENMASK(23, 20)
	#define COMBPHY_TEST_ADDR_SHIFT 12
	#define COMBPHY_TEST_ADDR_MASK GENMASK(16, 12)
	#define COMBPHY_CLKREF_OUT_OEN BIT(0)

	struct histb_combphy_mode {
	int fixed;
	int select;
	u32 reg;
	u32 shift;
	u32 mask;
	};

	struct histb_combphy_priv {
	void __iomem *mmio;
	struct regmap *syscon;
	struct reset_control *por_rst;
	struct clk *ref_clk;
	struct phy *phy;
	struct histb_combphy_mode mode;
	};

	static void nano_register_write(struct histb_combphy_priv *priv,
	u32 addr, u32 data)
	{
	void __iomem *reg = priv->mmio + COMBPHY_CFG_REG;
	u32 val;

	/* Set up address and data for the write */
	val = readl(reg);
	val &= ~COMBPHY_TEST_ADDR_MASK;
	val \|= addr << COMBPHY_TEST_ADDR_SHIFT;
	val &= ~COMBPHY_TEST_DATA_MASK;
	val \|= data << COMBPHY_TEST_DATA_SHIFT;
	writel(val, reg);

	/* Flip strobe control to trigger the write */
	val &= ~COMBPHY_TEST_WRITE;
	writel(val, reg);
	val \|= COMBPHY_TEST_WRITE;
	writel(val, reg);
	}

	static int is_mode_fixed(struct histb_combphy_mode *mode)
	{
	return (mode->fixed != PHY_NONE) ? true : false;
	}

	static int histb_combphy_set_mode(struct histb_combphy_priv *priv)
	{
	struct histb_combphy_mode *mode = &priv->mode;
	struct regmap *syscon = priv->syscon;
	u32 hw_sel;

	if (is_mode_fixed(mode))
	return 0;

	switch (mode->select) {
	case PHY_TYPE_SATA:
	hw_sel = COMBPHY_MODE_SATA;
	break;
	case PHY_TYPE_PCIE:
	hw_sel = COMBPHY_MODE_PCIE;
	break;
	case PHY_TYPE_USB3:
	hw_sel = COMBPHY_MODE_USB3;
	break;
	default:
	return -EINVAL;
	}

	return regmap_update_bits(syscon, mode->reg, mode->mask,
	hw_sel << mode->shift);
	}

	static int histb_combphy_init(struct phy *phy)
	{
	struct histb_combphy_priv *priv = phy_get_drvdata(phy);
	u32 val;
	int ret;

	ret = histb_combphy_set_mode(priv);
	if (ret)
	return ret;

	/* Clear bypass bit to enable encoding/decoding */
	val = readl(priv->mmio + COMBPHY_CFG_REG);
	val &= ~COMBPHY_BYPASS_CODEC;
	writel(val, priv->mmio + COMBPHY_CFG_REG);

	ret = clk_prepare_enable(priv->ref_clk);
	if (ret)
	return ret;

	reset_control_deassert(priv->por_rst);

	/* Enable EP clock */
	val = readl(priv->mmio + COMBPHY_CFG_REG);
	val \|= COMBPHY_CLKREF_OUT_OEN;
	writel(val, priv->mmio + COMBPHY_CFG_REG);

	/* Need to wait for EP clock stable */
	mdelay(5);

	/* Configure nano phy registers as suggested by vendor */
	nano_register_write(priv, 0x1, 0x8);
	nano_register_write(priv, 0xc, 0x9);
	nano_register_write(priv, 0x1a, 0x4);

	return 0;
	}

	static int histb_combphy_exit(struct phy *phy)
	{
	struct histb_combphy_priv *priv = phy_get_drvdata(phy);
	u32 val;

	/* Disable EP clock */
	val = readl(priv->mmio + COMBPHY_CFG_REG);
	val &= ~COMBPHY_CLKREF_OUT_OEN;
	writel(val, priv->mmio + COMBPHY_CFG_REG);

	reset_control_assert(priv->por_rst);
	clk_disable_unprepare(priv->ref_clk);

	return 0;
	}

	static const struct phy_ops histb_combphy_ops = {
	.init = histb_combphy_init,
	.exit = histb_combphy_exit,
	.owner = THIS_MODULE,
	};

	static struct phy histb_combphy_xlate(struct device dev,
	struct of_phandle_args *args)
	{
	struct histb_combphy_priv *priv = dev_get_drvdata(dev);
	struct histb_combphy_mode *mode = &priv->mode;

	if (args->args_count < 1) {
	dev_err(dev, "invalid number of arguments\n");
	return ERR_PTR(-EINVAL);
	}

	mode->select = args->args[0];

	if (mode->select < PHY_TYPE_SATA \|\| mode->select > PHY_TYPE_USB3) {
	dev_err(dev, "invalid phy mode select argument\n");
	return ERR_PTR(-EINVAL);
	}

	if (is_mode_fixed(mode) && mode->select != mode->fixed) {
	dev_err(dev, "mode select %d mismatch fixed phy mode %d\n",
	mode->select, mode->fixed);
	return ERR_PTR(-EINVAL);
	}

	return priv->phy;
	}

	static int histb_combphy_probe(struct platform_device *pdev)
	{
	struct phy_provider *phy_provider;
	struct device *dev = &pdev->dev;
	struct histb_combphy_priv *priv;
	struct device_node *np = dev->of_node;
	struct histb_combphy_mode *mode;
	struct resource *res;
	u32 vals[3];
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->mmio = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->mmio)) {
	ret = PTR_ERR(priv->mmio);
	return ret;
	}

	priv->syscon = syscon_node_to_regmap(np->parent);
	if (IS_ERR(priv->syscon)) {
	dev_err(dev, "failed to find peri_ctrl syscon regmap\n");
	return PTR_ERR(priv->syscon);
	}

	mode = &priv->mode;
	mode->fixed = PHY_NONE;

	ret = of_property_read_u32(np, "hisilicon,fixed-mode", &mode->fixed);
	if (ret == 0)
	dev_dbg(dev, "found fixed phy mode %d\n", mode->fixed);

	ret = of_property_read_u32_array(np, "hisilicon,mode-select-bits",
	vals, ARRAY_SIZE(vals));
	if (ret == 0) {
	if (is_mode_fixed(mode)) {
	dev_err(dev, "found select bits for fixed mode phy\n");
	return -EINVAL;
	}

	mode->reg = vals[0];
	mode->shift = vals[1];
	mode->mask = vals[2];
	dev_dbg(dev, "found mode select bits\n");
	} else {
	if (!is_mode_fixed(mode)) {
	dev_err(dev, "no valid select bits found for non-fixed phy\n");
	return -ENODEV;
	}
	}

	priv->ref_clk = devm_clk_get(dev, NULL);
	if (IS_ERR(priv->ref_clk)) {
	dev_err(dev, "failed to find ref clock\n");
	return PTR_ERR(priv->ref_clk);
	}

	priv->por_rst = devm_reset_control_get(dev, NULL);
	if (IS_ERR(priv->por_rst)) {
	dev_err(dev, "failed to get poweron reset\n");
	return PTR_ERR(priv->por_rst);
	}

	priv->phy = devm_phy_create(dev, NULL, &histb_combphy_ops);
	if (IS_ERR(priv->phy)) {
	dev_err(dev, "failed to create combphy\n");
	return PTR_ERR(priv->phy);
	}

	dev_set_drvdata(dev, priv);
	phy_set_drvdata(priv->phy, priv);

	phy_provider = devm_of_phy_provider_register(dev, histb_combphy_xlate);
	return PTR_ERR_OR_ZERO(phy_provider);
	}

	static const struct of_device_id histb_combphy_of_match[] = {
	{ .compatible = "hisilicon,hi3798cv200-combphy" },
	{ },
	};
	MODULE_DEVICE_TABLE(of, histb_combphy_of_match);

	static struct platform_driver histb_combphy_driver = {
	.probe = histb_combphy_probe,
	.driver = {
	.name = "combphy",
	.of_match_table = histb_combphy_of_match,
	},
	};
	module_platform_driver(histb_combphy_driver);

	MODULE_DESCRIPTION("HiSilicon STB COMBPHY driver");
	MODULE_LICENSE("GPL v2");