drivers/clk/clk-max77686.c - kernel/msm - Git at Google

 /*
  * clk-max77686.c - Clock driver for Maxim 77686/MAX77802
  *
  * Copyright (C) 2012 Samsung Electornics
  * Jonghwa Lee <jonghwa3.lee@samsung.com>
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/max77620.h>
 #include <linux/mfd/max77686.h>
 #include <linux/mfd/max77686-private.h>
 #include <linux/clk-provider.h>
 #include <linux/mutex.h>
 #include <linux/clkdev.h>
 #include <linux/of.h>
 #include <linux/regmap.h>

 #include <dt-bindings/clock/maxim,max77686.h>
 #include <dt-bindings/clock/maxim,max77802.h>
 #include <dt-bindings/clock/maxim,max77620.h>

 #define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3

 enum max77686_chip_name {
 	CHIP_MAX77686,
 	CHIP_MAX77802,
 	CHIP_MAX77620,
 };

 struct max77686_hw_clk_info {
 	const char *name;
 	u32 clk_reg;
 	u32 clk_enable_mask;
 	u32 flags;
 };

 struct max77686_clk_init_data {
 	struct regmap *regmap;
 	struct clk_hw hw;
 	struct clk_init_data clk_idata;
 	const struct max77686_hw_clk_info *clk_info;
 };

 struct max77686_clk_driver_data {
 	enum max77686_chip_name chip;
 	struct max77686_clk_init_data *max_clk_data;
 	size_t num_clks;
 };

 static const struct
 max77686_hw_clk_info max77686_hw_clks_info[MAX77686_CLKS_NUM] = {
 	[MAX77686_CLK_AP] = {
 		.name = "32khz_ap",
 		.clk_reg = MAX77686_REG_32KHZ,
 		.clk_enable_mask = BIT(MAX77686_CLK_AP),
 	},
 	[MAX77686_CLK_CP] = {
 		.name = "32khz_cp",
 		.clk_reg = MAX77686_REG_32KHZ,
 		.clk_enable_mask = BIT(MAX77686_CLK_CP),
 	},
 	[MAX77686_CLK_PMIC] = {
 		.name = "32khz_pmic",
 		.clk_reg = MAX77686_REG_32KHZ,
 		.clk_enable_mask = BIT(MAX77686_CLK_PMIC),
 	},
 };

 static const struct
 max77686_hw_clk_info max77802_hw_clks_info[MAX77802_CLKS_NUM] = {
 	[MAX77802_CLK_32K_AP] = {
 		.name = "32khz_ap",
 		.clk_reg = MAX77802_REG_32KHZ,
 		.clk_enable_mask = BIT(MAX77802_CLK_32K_AP),
 	},
 	[MAX77802_CLK_32K_CP] = {
 		.name = "32khz_cp",
 		.clk_reg = MAX77802_REG_32KHZ,
 		.clk_enable_mask = BIT(MAX77802_CLK_32K_CP),
 	},
 };

 static const struct
 max77686_hw_clk_info max77620_hw_clks_info[MAX77620_CLKS_NUM] = {
 	[MAX77620_CLK_32K_OUT0] = {
 		.name = "32khz_out0",
 		.clk_reg = MAX77620_REG_CNFG1_32K,
 		.clk_enable_mask = MAX77620_CNFG1_32K_OUT0_EN,
 	},
 };

 static struct max77686_clk_init_data *to_max77686_clk_init_data(
 				struct clk_hw *hw)
 {
 	return container_of(hw, struct max77686_clk_init_data, hw);
 }

 static int max77686_clk_prepare(struct clk_hw *hw)
 {
 	struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);

 	return regmap_update_bits(max77686->regmap, max77686->clk_info->clk_reg,
 				  max77686->clk_info->clk_enable_mask,
 				  max77686->clk_info->clk_enable_mask);
 }

 static void max77686_clk_unprepare(struct clk_hw *hw)
 {
 	struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);

 	regmap_update_bits(max77686->regmap, max77686->clk_info->clk_reg,
 			   max77686->clk_info->clk_enable_mask,
 			   ~max77686->clk_info->clk_enable_mask);
 }

 static int max77686_clk_is_prepared(struct clk_hw *hw)
 {
 	struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);
 	int ret;
 	u32 val;

 	ret = regmap_read(max77686->regmap, max77686->clk_info->clk_reg, &val);

 	if (ret < 0)
 		return -EINVAL;

 	return val & max77686->clk_info->clk_enable_mask;
 }

 static unsigned long max77686_recalc_rate(struct clk_hw *hw,
 					  unsigned long parent_rate)
 {
 	return 32768;
 }

 static struct clk_ops max77686_clk_ops = {
 	.prepare	= max77686_clk_prepare,
 	.unprepare	= max77686_clk_unprepare,
 	.is_prepared	= max77686_clk_is_prepared,
 	.recalc_rate	= max77686_recalc_rate,
 };

 static struct clk_hw *
 of_clk_max77686_get(struct of_phandle_args *clkspec, void *data)
 {
 	struct max77686_clk_driver_data *drv_data = data;
 	unsigned int idx = clkspec->args[0];

 	if (idx >= drv_data->num_clks) {
 		pr_err("%s: invalid index %u\n", __func__, idx);
 		return ERR_PTR(-EINVAL);
 	}

 	return &drv_data->max_clk_data[idx].hw;
 }

 static int max77686_clk_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device *parent = dev->parent;
 	const struct platform_device_id *id = platform_get_device_id(pdev);
 	struct max77686_clk_driver_data *drv_data;
 	const struct max77686_hw_clk_info *hw_clks;
 	struct regmap *regmap;
 	int i, ret, num_clks;

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

 	regmap = dev_get_regmap(parent, NULL);
 	if (!regmap) {
 		dev_err(dev, "Failed to get rtc regmap\n");
 		return -ENODEV;
 	}

 	drv_data->chip = id->driver_data;

 	switch (drv_data->chip) {
 	case CHIP_MAX77686:
 		num_clks = MAX77686_CLKS_NUM;
 		hw_clks = max77686_hw_clks_info;
 		break;

 	case CHIP_MAX77802:
 		num_clks = MAX77802_CLKS_NUM;
 		hw_clks = max77802_hw_clks_info;
 		break;

 	case CHIP_MAX77620:
 		num_clks = MAX77620_CLKS_NUM;
 		hw_clks = max77620_hw_clks_info;
 		break;

 	default:
 		dev_err(dev, "Unknown Chip ID\n");
 		return -EINVAL;
 	}

 	drv_data->num_clks = num_clks;
 	drv_data->max_clk_data = devm_kcalloc(dev, num_clks,
 					      sizeof(*drv_data->max_clk_data),
 					      GFP_KERNEL);
 	if (!drv_data->max_clk_data)
 		return -ENOMEM;

 	for (i = 0; i < num_clks; i++) {
 		struct max77686_clk_init_data *max_clk_data;
 		const char *clk_name;

 		max_clk_data = &drv_data->max_clk_data[i];

 		max_clk_data->regmap = regmap;
 		max_clk_data->clk_info = &hw_clks[i];
 		max_clk_data->clk_idata.flags = hw_clks[i].flags;
 		max_clk_data->clk_idata.ops = &max77686_clk_ops;

 		if (parent->of_node &&
 		    !of_property_read_string_index(parent->of_node,
 						   "clock-output-names",
 						   i, &clk_name))
 			max_clk_data->clk_idata.name = clk_name;
 		else
 			max_clk_data->clk_idata.name = hw_clks[i].name;

 		max_clk_data->hw.init = &max_clk_data->clk_idata;

 		ret = devm_clk_hw_register(dev, &max_clk_data->hw);
 		if (ret) {
 			dev_err(dev, "Failed to clock register: %d\n", ret);
 			return ret;
 		}

 		ret = clk_hw_register_clkdev(&max_clk_data->hw,
 					     max_clk_data->clk_idata.name, NULL);
 		if (ret < 0) {
 			dev_err(dev, "Failed to clkdev register: %d\n", ret);
 			return ret;
 		}
 	}

 	if (parent->of_node) {
 		ret = of_clk_add_hw_provider(parent->of_node, of_clk_max77686_get,
 					     drv_data);

 		if (ret < 0) {
 			dev_err(dev, "Failed to register OF clock provider: %d\n",
 				ret);
 			return ret;
 		}
 	}

 	/* MAX77802: Enable low-jitter mode on the 32khz clocks. */
 	if (drv_data->chip == CHIP_MAX77802) {
 		ret = regmap_update_bits(regmap, MAX77802_REG_32KHZ,
 					 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
 					 1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
 		if (ret < 0) {
 			dev_err(dev, "Failed to config low-jitter: %d\n", ret);
 			goto remove_of_clk_provider;
 		}
 	}

 	return 0;

 remove_of_clk_provider:
 	if (parent->of_node)
 		of_clk_del_provider(parent->of_node);

 	return ret;
 }

 static int max77686_clk_remove(struct platform_device *pdev)
 {
 	struct device *parent = pdev->dev.parent;

 	if (parent->of_node)
 		of_clk_del_provider(parent->of_node);

 	return 0;
 }

 static const struct platform_device_id max77686_clk_id[] = {
 	{ "max77686-clk", .driver_data = CHIP_MAX77686, },
 	{ "max77802-clk", .driver_data = CHIP_MAX77802, },
 	{ "max77620-clock", .driver_data = CHIP_MAX77620, },
 	{},
 };
 MODULE_DEVICE_TABLE(platform, max77686_clk_id);

 static struct platform_driver max77686_clk_driver = {
 	.driver = {
 		.name  = "max77686-clk",
 	},
 	.probe = max77686_clk_probe,
 	.remove = max77686_clk_remove,
 	.id_table = max77686_clk_id,
 };

 module_platform_driver(max77686_clk_driver);

 MODULE_DESCRIPTION("MAXIM 77686 Clock Driver");
 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 MODULE_LICENSE("GPL");
	/*
	* clk-max77686.c - Clock driver for Maxim 77686/MAX77802
	*
	* Copyright (C) 2012 Samsung Electornics
	* Jonghwa Lee <jonghwa3.lee@samsung.com>
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/max77620.h>
	#include <linux/mfd/max77686.h>
	#include <linux/mfd/max77686-private.h>
	#include <linux/clk-provider.h>
	#include <linux/mutex.h>
	#include <linux/clkdev.h>
	#include <linux/of.h>
	#include <linux/regmap.h>

	#include <dt-bindings/clock/maxim,max77686.h>
	#include <dt-bindings/clock/maxim,max77802.h>
	#include <dt-bindings/clock/maxim,max77620.h>

	#define MAX77802_CLOCK_LOW_JITTER_SHIFT 0x3

	enum max77686_chip_name {
	CHIP_MAX77686,
	CHIP_MAX77802,
	CHIP_MAX77620,
	};

	struct max77686_hw_clk_info {
	const char *name;
	u32 clk_reg;
	u32 clk_enable_mask;
	u32 flags;
	};

	struct max77686_clk_init_data {
	struct regmap *regmap;
	struct clk_hw hw;
	struct clk_init_data clk_idata;
	const struct max77686_hw_clk_info *clk_info;
	};

	struct max77686_clk_driver_data {
	enum max77686_chip_name chip;
	struct max77686_clk_init_data *max_clk_data;
	size_t num_clks;
	};

	static const struct
	max77686_hw_clk_info max77686_hw_clks_info[MAX77686_CLKS_NUM] = {
	[MAX77686_CLK_AP] = {
	.name = "32khz_ap",
	.clk_reg = MAX77686_REG_32KHZ,
	.clk_enable_mask = BIT(MAX77686_CLK_AP),
	},
	[MAX77686_CLK_CP] = {
	.name = "32khz_cp",
	.clk_reg = MAX77686_REG_32KHZ,
	.clk_enable_mask = BIT(MAX77686_CLK_CP),
	},
	[MAX77686_CLK_PMIC] = {
	.name = "32khz_pmic",
	.clk_reg = MAX77686_REG_32KHZ,
	.clk_enable_mask = BIT(MAX77686_CLK_PMIC),
	},
	};

	static const struct
	max77686_hw_clk_info max77802_hw_clks_info[MAX77802_CLKS_NUM] = {
	[MAX77802_CLK_32K_AP] = {
	.name = "32khz_ap",
	.clk_reg = MAX77802_REG_32KHZ,
	.clk_enable_mask = BIT(MAX77802_CLK_32K_AP),
	},
	[MAX77802_CLK_32K_CP] = {
	.name = "32khz_cp",
	.clk_reg = MAX77802_REG_32KHZ,
	.clk_enable_mask = BIT(MAX77802_CLK_32K_CP),
	},
	};

	static const struct
	max77686_hw_clk_info max77620_hw_clks_info[MAX77620_CLKS_NUM] = {
	[MAX77620_CLK_32K_OUT0] = {
	.name = "32khz_out0",
	.clk_reg = MAX77620_REG_CNFG1_32K,
	.clk_enable_mask = MAX77620_CNFG1_32K_OUT0_EN,
	},
	};

	static struct max77686_clk_init_data *to_max77686_clk_init_data(
	struct clk_hw *hw)
	{
	return container_of(hw, struct max77686_clk_init_data, hw);
	}

	static int max77686_clk_prepare(struct clk_hw *hw)
	{
	struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);

	return regmap_update_bits(max77686->regmap, max77686->clk_info->clk_reg,
	max77686->clk_info->clk_enable_mask,
	max77686->clk_info->clk_enable_mask);
	}

	static void max77686_clk_unprepare(struct clk_hw *hw)
	{
	struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);

	regmap_update_bits(max77686->regmap, max77686->clk_info->clk_reg,
	max77686->clk_info->clk_enable_mask,
	~max77686->clk_info->clk_enable_mask);
	}

	static int max77686_clk_is_prepared(struct clk_hw *hw)
	{
	struct max77686_clk_init_data *max77686 = to_max77686_clk_init_data(hw);
	int ret;
	u32 val;

	ret = regmap_read(max77686->regmap, max77686->clk_info->clk_reg, &val);

	if (ret < 0)
	return -EINVAL;

	return val & max77686->clk_info->clk_enable_mask;
	}

	static unsigned long max77686_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	return 32768;
	}

	static struct clk_ops max77686_clk_ops = {
	.prepare = max77686_clk_prepare,
	.unprepare = max77686_clk_unprepare,
	.is_prepared = max77686_clk_is_prepared,
	.recalc_rate = max77686_recalc_rate,
	};

	static struct clk_hw *
	of_clk_max77686_get(struct of_phandle_args clkspec, void data)
	{
	struct max77686_clk_driver_data *drv_data = data;
	unsigned int idx = clkspec->args[0];

	if (idx >= drv_data->num_clks) {
	pr_err("%s: invalid index %u\n", __func__, idx);
	return ERR_PTR(-EINVAL);
	}

	return &drv_data->max_clk_data[idx].hw;
	}

	static int max77686_clk_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device *parent = dev->parent;
	const struct platform_device_id *id = platform_get_device_id(pdev);
	struct max77686_clk_driver_data *drv_data;
	const struct max77686_hw_clk_info *hw_clks;
	struct regmap *regmap;
	int i, ret, num_clks;

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

	regmap = dev_get_regmap(parent, NULL);
	if (!regmap) {
	dev_err(dev, "Failed to get rtc regmap\n");
	return -ENODEV;
	}

	drv_data->chip = id->driver_data;

	switch (drv_data->chip) {
	case CHIP_MAX77686:
	num_clks = MAX77686_CLKS_NUM;
	hw_clks = max77686_hw_clks_info;
	break;

	case CHIP_MAX77802:
	num_clks = MAX77802_CLKS_NUM;
	hw_clks = max77802_hw_clks_info;
	break;

	case CHIP_MAX77620:
	num_clks = MAX77620_CLKS_NUM;
	hw_clks = max77620_hw_clks_info;
	break;

	default:
	dev_err(dev, "Unknown Chip ID\n");
	return -EINVAL;
	}

	drv_data->num_clks = num_clks;
	drv_data->max_clk_data = devm_kcalloc(dev, num_clks,
	sizeof(*drv_data->max_clk_data),
	GFP_KERNEL);
	if (!drv_data->max_clk_data)
	return -ENOMEM;

	for (i = 0; i < num_clks; i++) {
	struct max77686_clk_init_data *max_clk_data;
	const char *clk_name;

	max_clk_data = &drv_data->max_clk_data[i];

	max_clk_data->regmap = regmap;
	max_clk_data->clk_info = &hw_clks[i];
	max_clk_data->clk_idata.flags = hw_clks[i].flags;
	max_clk_data->clk_idata.ops = &max77686_clk_ops;

	if (parent->of_node &&
	!of_property_read_string_index(parent->of_node,
	"clock-output-names",
	i, &clk_name))
	max_clk_data->clk_idata.name = clk_name;
	else
	max_clk_data->clk_idata.name = hw_clks[i].name;

	max_clk_data->hw.init = &max_clk_data->clk_idata;

	ret = devm_clk_hw_register(dev, &max_clk_data->hw);
	if (ret) {
	dev_err(dev, "Failed to clock register: %d\n", ret);
	return ret;
	}

	ret = clk_hw_register_clkdev(&max_clk_data->hw,
	max_clk_data->clk_idata.name, NULL);
	if (ret < 0) {
	dev_err(dev, "Failed to clkdev register: %d\n", ret);
	return ret;
	}
	}

	if (parent->of_node) {
	ret = of_clk_add_hw_provider(parent->of_node, of_clk_max77686_get,
	drv_data);

	if (ret < 0) {
	dev_err(dev, "Failed to register OF clock provider: %d\n",
	ret);
	return ret;
	}
	}

	/* MAX77802: Enable low-jitter mode on the 32khz clocks. */
	if (drv_data->chip == CHIP_MAX77802) {
	ret = regmap_update_bits(regmap, MAX77802_REG_32KHZ,
	1 << MAX77802_CLOCK_LOW_JITTER_SHIFT,
	1 << MAX77802_CLOCK_LOW_JITTER_SHIFT);
	if (ret < 0) {
	dev_err(dev, "Failed to config low-jitter: %d\n", ret);
	goto remove_of_clk_provider;
	}
	}

	return 0;

	remove_of_clk_provider:
	if (parent->of_node)
	of_clk_del_provider(parent->of_node);

	return ret;
	}

	static int max77686_clk_remove(struct platform_device *pdev)
	{
	struct device *parent = pdev->dev.parent;

	if (parent->of_node)
	of_clk_del_provider(parent->of_node);

	return 0;
	}

	static const struct platform_device_id max77686_clk_id[] = {
	{ "max77686-clk", .driver_data = CHIP_MAX77686, },
	{ "max77802-clk", .driver_data = CHIP_MAX77802, },
	{ "max77620-clock", .driver_data = CHIP_MAX77620, },
	{},
	};
	MODULE_DEVICE_TABLE(platform, max77686_clk_id);

	static struct platform_driver max77686_clk_driver = {
	.driver = {
	.name = "max77686-clk",
	},
	.probe = max77686_clk_probe,
	.remove = max77686_clk_remove,
	.id_table = max77686_clk_id,
	};

	module_platform_driver(max77686_clk_driver);

	MODULE_DESCRIPTION("MAXIM 77686 Clock Driver");
	MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
	MODULE_LICENSE("GPL");