drivers/clk/clk-s2mps11.c - arm/linux - Git at Google

 /*
  * clk-s2mps11.c - Clock driver for S2MPS11.
  *
  * Copyright (C) 2013,2014 Samsung Electornics
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */

 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/of.h>
 #include <linux/clkdev.h>
 #include <linux/regmap.h>
 #include <linux/clk-provider.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/samsung/s2mps11.h>
 #include <linux/mfd/samsung/s2mps13.h>
 #include <linux/mfd/samsung/s2mps14.h>
 #include <linux/mfd/samsung/s5m8767.h>
 #include <linux/mfd/samsung/core.h>

 enum {
 	S2MPS11_CLK_AP = 0,
 	S2MPS11_CLK_CP,
 	S2MPS11_CLK_BT,
 	S2MPS11_CLKS_NUM,
 };

 struct s2mps11_clk {
 	struct sec_pmic_dev *iodev;
 	struct device_node *clk_np;
 	struct clk_hw hw;
 	struct clk *clk;
 	struct clk_lookup *lookup;
 	u32 mask;
 	unsigned int reg;
 };

 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
 {
 	return container_of(hw, struct s2mps11_clk, hw);
 }

 static int s2mps11_clk_prepare(struct clk_hw *hw)
 {
 	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

 	return regmap_update_bits(s2mps11->iodev->regmap_pmic,
 				 s2mps11->reg,
 				 s2mps11->mask, s2mps11->mask);
 }

 static void s2mps11_clk_unprepare(struct clk_hw *hw)
 {
 	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

 	regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
 			   s2mps11->mask, ~s2mps11->mask);
 }

 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
 {
 	int ret;
 	u32 val;
 	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

 	ret = regmap_read(s2mps11->iodev->regmap_pmic,
 				s2mps11->reg, &val);
 	if (ret < 0)
 		return -EINVAL;

 	return val & s2mps11->mask;
 }

 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
 					     unsigned long parent_rate)
 {
 	return 32768;
 }

 static struct clk_ops s2mps11_clk_ops = {
 	.prepare	= s2mps11_clk_prepare,
 	.unprepare	= s2mps11_clk_unprepare,
 	.is_prepared	= s2mps11_clk_is_prepared,
 	.recalc_rate	= s2mps11_clk_recalc_rate,
 };

 /* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
 	[S2MPS11_CLK_AP] = {
 		.name = "s2mps11_ap",
 		.ops = &s2mps11_clk_ops,
 	},
 	[S2MPS11_CLK_CP] = {
 		.name = "s2mps11_cp",
 		.ops = &s2mps11_clk_ops,
 	},
 	[S2MPS11_CLK_BT] = {
 		.name = "s2mps11_bt",
 		.ops = &s2mps11_clk_ops,
 	},
 };

 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
 		struct clk_init_data *clks_init)
 {
 	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct device_node *clk_np;
 	int i;

 	if (!iodev->dev->of_node)
 		return ERR_PTR(-EINVAL);

 	clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
 	if (!clk_np) {
 		dev_err(&pdev->dev, "could not find clock sub-node\n");
 		return ERR_PTR(-EINVAL);
 	}

 	for (i = 0; i < S2MPS11_CLKS_NUM; i++)
 		of_property_read_string_index(clk_np, "clock-output-names", i,
 				&clks_init[i].name);

 	return clk_np;
 }

 static int s2mps11_clk_probe(struct platform_device *pdev)
 {
 	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct s2mps11_clk *s2mps11_clks;
 	struct clk_hw_onecell_data *clk_data;
 	unsigned int s2mps11_reg;
 	int i, ret = 0;
 	enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data;

 	s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
 				sizeof(*s2mps11_clks), GFP_KERNEL);
 	if (!s2mps11_clks)
 		return -ENOMEM;

 	clk_data = devm_kzalloc(&pdev->dev, sizeof(*clk_data) +
 				sizeof(*clk_data->hws) * S2MPS11_CLKS_NUM,
 				GFP_KERNEL);
 	if (!clk_data)
 		return -ENOMEM;

 	switch (hwid) {
 	case S2MPS11X:
 		s2mps11_reg = S2MPS11_REG_RTC_CTRL;
 		break;
 	case S2MPS13X:
 		s2mps11_reg = S2MPS13_REG_RTCCTRL;
 		break;
 	case S2MPS14X:
 		s2mps11_reg = S2MPS14_REG_RTCCTRL;
 		break;
 	case S5M8767X:
 		s2mps11_reg = S5M8767_REG_CTRL1;
 		break;
 	default:
 		dev_err(&pdev->dev, "Invalid device type\n");
 		return -EINVAL;
 	}

 	/* Store clocks of_node in first element of s2mps11_clks array */
 	s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init);
 	if (IS_ERR(s2mps11_clks->clk_np))
 		return PTR_ERR(s2mps11_clks->clk_np);

 	for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 		if (i == S2MPS11_CLK_CP && hwid == S2MPS14X)
 			continue; /* Skip clocks not present in some devices */
 		s2mps11_clks[i].iodev = iodev;
 		s2mps11_clks[i].hw.init = &s2mps11_clks_init[i];
 		s2mps11_clks[i].mask = 1 << i;
 		s2mps11_clks[i].reg = s2mps11_reg;

 		s2mps11_clks[i].clk = devm_clk_register(&pdev->dev,
 							&s2mps11_clks[i].hw);
 		if (IS_ERR(s2mps11_clks[i].clk)) {
 			dev_err(&pdev->dev, "Fail to register : %s\n",
 						s2mps11_clks_init[i].name);
 			ret = PTR_ERR(s2mps11_clks[i].clk);
 			goto err_reg;
 		}

 		s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw,
 					s2mps11_clks_init[i].name, NULL);
 		if (!s2mps11_clks[i].lookup) {
 			ret = -ENOMEM;
 			goto err_reg;
 		}
 		clk_data->hws[i] = &s2mps11_clks[i].hw;
 	}

 	clk_data->num = S2MPS11_CLKS_NUM;
 	of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get,
 			       clk_data);

 	platform_set_drvdata(pdev, s2mps11_clks);

 	return ret;

 err_reg:
 	while (--i >= 0)
 		clkdev_drop(s2mps11_clks[i].lookup);

 	return ret;
 }

 static int s2mps11_clk_remove(struct platform_device *pdev)
 {
 	struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
 	int i;

 	of_clk_del_provider(s2mps11_clks[0].clk_np);
 	/* Drop the reference obtained in s2mps11_clk_parse_dt */
 	of_node_put(s2mps11_clks[0].clk_np);

 	for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 		/* Skip clocks not present on S2MPS14 */
 		if (!s2mps11_clks[i].lookup)
 			continue;
 		clkdev_drop(s2mps11_clks[i].lookup);
 	}

 	return 0;
 }

 static const struct platform_device_id s2mps11_clk_id[] = {
 	{ "s2mps11-clk", S2MPS11X},
 	{ "s2mps13-clk", S2MPS13X},
 	{ "s2mps14-clk", S2MPS14X},
 	{ "s5m8767-clk", S5M8767X},
 	{ },
 };
 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);

 static struct platform_driver s2mps11_clk_driver = {
 	.driver = {
 		.name  = "s2mps11-clk",
 	},
 	.probe = s2mps11_clk_probe,
 	.remove = s2mps11_clk_remove,
 	.id_table = s2mps11_clk_id,
 };

 static int __init s2mps11_clk_init(void)
 {
 	return platform_driver_register(&s2mps11_clk_driver);
 }
 subsys_initcall(s2mps11_clk_init);

 static void __exit s2mps11_clk_cleanup(void)
 {
 	platform_driver_unregister(&s2mps11_clk_driver);
 }
 module_exit(s2mps11_clk_cleanup);

 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
 MODULE_LICENSE("GPL");
	/*
	* clk-s2mps11.c - Clock driver for S2MPS11.
	*
	* Copyright (C) 2013,2014 Samsung Electornics
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	#include <linux/module.h>
	#include <linux/err.h>
	#include <linux/of.h>
	#include <linux/clkdev.h>
	#include <linux/regmap.h>
	#include <linux/clk-provider.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/samsung/s2mps11.h>
	#include <linux/mfd/samsung/s2mps13.h>
	#include <linux/mfd/samsung/s2mps14.h>
	#include <linux/mfd/samsung/s5m8767.h>
	#include <linux/mfd/samsung/core.h>

	enum {
	S2MPS11_CLK_AP = 0,
	S2MPS11_CLK_CP,
	S2MPS11_CLK_BT,
	S2MPS11_CLKS_NUM,
	};

	struct s2mps11_clk {
	struct sec_pmic_dev *iodev;
	struct device_node *clk_np;
	struct clk_hw hw;
	struct clk *clk;
	struct clk_lookup *lookup;
	u32 mask;
	unsigned int reg;
	};

	static struct s2mps11_clk to_s2mps11_clk(struct clk_hw hw)
	{
	return container_of(hw, struct s2mps11_clk, hw);
	}

	static int s2mps11_clk_prepare(struct clk_hw *hw)
	{
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

	return regmap_update_bits(s2mps11->iodev->regmap_pmic,
	s2mps11->reg,
	s2mps11->mask, s2mps11->mask);
	}

	static void s2mps11_clk_unprepare(struct clk_hw *hw)
	{
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

	regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
	s2mps11->mask, ~s2mps11->mask);
	}

	static int s2mps11_clk_is_prepared(struct clk_hw *hw)
	{
	int ret;
	u32 val;
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

	ret = regmap_read(s2mps11->iodev->regmap_pmic,
	s2mps11->reg, &val);
	if (ret < 0)
	return -EINVAL;

	return val & s2mps11->mask;
	}

	static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return 32768;
	}

	static struct clk_ops s2mps11_clk_ops = {
	.prepare = s2mps11_clk_prepare,
	.unprepare = s2mps11_clk_unprepare,
	.is_prepared = s2mps11_clk_is_prepared,
	.recalc_rate = s2mps11_clk_recalc_rate,
	};

	/* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
	static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
	[S2MPS11_CLK_AP] = {
	.name = "s2mps11_ap",
	.ops = &s2mps11_clk_ops,
	},
	[S2MPS11_CLK_CP] = {
	.name = "s2mps11_cp",
	.ops = &s2mps11_clk_ops,
	},
	[S2MPS11_CLK_BT] = {
	.name = "s2mps11_bt",
	.ops = &s2mps11_clk_ops,
	},
	};

	static struct device_node s2mps11_clk_parse_dt(struct platform_device pdev,
	struct clk_init_data *clks_init)
	{
	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct device_node *clk_np;
	int i;

	if (!iodev->dev->of_node)
	return ERR_PTR(-EINVAL);

	clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
	if (!clk_np) {
	dev_err(&pdev->dev, "could not find clock sub-node\n");
	return ERR_PTR(-EINVAL);
	}

	for (i = 0; i < S2MPS11_CLKS_NUM; i++)
	of_property_read_string_index(clk_np, "clock-output-names", i,
	&clks_init[i].name);

	return clk_np;
	}

	static int s2mps11_clk_probe(struct platform_device *pdev)
	{
	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct s2mps11_clk *s2mps11_clks;
	struct clk_hw_onecell_data *clk_data;
	unsigned int s2mps11_reg;
	int i, ret = 0;
	enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data;

	s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
	sizeof(*s2mps11_clks), GFP_KERNEL);
	if (!s2mps11_clks)
	return -ENOMEM;

	clk_data = devm_kzalloc(&pdev->dev, sizeof(*clk_data) +
	sizeof(clk_data->hws) S2MPS11_CLKS_NUM,
	GFP_KERNEL);
	if (!clk_data)
	return -ENOMEM;

	switch (hwid) {
	case S2MPS11X:
	s2mps11_reg = S2MPS11_REG_RTC_CTRL;
	break;
	case S2MPS13X:
	s2mps11_reg = S2MPS13_REG_RTCCTRL;
	break;
	case S2MPS14X:
	s2mps11_reg = S2MPS14_REG_RTCCTRL;
	break;
	case S5M8767X:
	s2mps11_reg = S5M8767_REG_CTRL1;
	break;
	default:
	dev_err(&pdev->dev, "Invalid device type\n");
	return -EINVAL;
	}

	/* Store clocks of_node in first element of s2mps11_clks array */
	s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init);
	if (IS_ERR(s2mps11_clks->clk_np))
	return PTR_ERR(s2mps11_clks->clk_np);

	for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
	if (i == S2MPS11_CLK_CP && hwid == S2MPS14X)
	continue; /* Skip clocks not present in some devices */
	s2mps11_clks[i].iodev = iodev;
	s2mps11_clks[i].hw.init = &s2mps11_clks_init[i];
	s2mps11_clks[i].mask = 1 << i;
	s2mps11_clks[i].reg = s2mps11_reg;

	s2mps11_clks[i].clk = devm_clk_register(&pdev->dev,
	&s2mps11_clks[i].hw);
	if (IS_ERR(s2mps11_clks[i].clk)) {
	dev_err(&pdev->dev, "Fail to register : %s\n",
	s2mps11_clks_init[i].name);
	ret = PTR_ERR(s2mps11_clks[i].clk);
	goto err_reg;
	}

	s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw,
	s2mps11_clks_init[i].name, NULL);
	if (!s2mps11_clks[i].lookup) {
	ret = -ENOMEM;
	goto err_reg;
	}
	clk_data->hws[i] = &s2mps11_clks[i].hw;
	}

	clk_data->num = S2MPS11_CLKS_NUM;
	of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get,
	clk_data);

	platform_set_drvdata(pdev, s2mps11_clks);

	return ret;

	err_reg:
	while (--i >= 0)
	clkdev_drop(s2mps11_clks[i].lookup);

	return ret;
	}

	static int s2mps11_clk_remove(struct platform_device *pdev)
	{
	struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
	int i;

	of_clk_del_provider(s2mps11_clks[0].clk_np);
	/* Drop the reference obtained in s2mps11_clk_parse_dt */
	of_node_put(s2mps11_clks[0].clk_np);

	for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
	/* Skip clocks not present on S2MPS14 */
	if (!s2mps11_clks[i].lookup)
	continue;
	clkdev_drop(s2mps11_clks[i].lookup);
	}

	return 0;
	}

	static const struct platform_device_id s2mps11_clk_id[] = {
	{ "s2mps11-clk", S2MPS11X},
	{ "s2mps13-clk", S2MPS13X},
	{ "s2mps14-clk", S2MPS14X},
	{ "s5m8767-clk", S5M8767X},
	{ },
	};
	MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);

	static struct platform_driver s2mps11_clk_driver = {
	.driver = {
	.name = "s2mps11-clk",
	},
	.probe = s2mps11_clk_probe,
	.remove = s2mps11_clk_remove,
	.id_table = s2mps11_clk_id,
	};

	static int __init s2mps11_clk_init(void)
	{
	return platform_driver_register(&s2mps11_clk_driver);
	}
	subsys_initcall(s2mps11_clk_init);

	static void __exit s2mps11_clk_cleanup(void)
	{
	platform_driver_unregister(&s2mps11_clk_driver);
	}
	module_exit(s2mps11_clk_cleanup);

	MODULE_DESCRIPTION("S2MPS11 Clock Driver");
	MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
	MODULE_LICENSE("GPL");