[linux-2.6-block.git] / drivers / clk / clk-rk808.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Clkout driver for Rockchip RK808
 *
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author:Chris Zhong <zyw@rock-chips.com>
 */

#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mfd/rk808.h>

struct rk808_clkout {
	struct regmap		*regmap;
	struct clk_hw		clkout1_hw;
	struct clk_hw		clkout2_hw;
};

static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
					      unsigned long parent_rate)
{
	return 32768;
}

static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);

	return regmap_update_bits(rk808_clkout->regmap, RK808_CLK32OUT_REG,
				  CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
}

static int rk808_clkout2_prepare(struct clk_hw *hw)
{
	return rk808_clkout2_enable(hw, true);
}

static void rk808_clkout2_unprepare(struct clk_hw *hw)
{
	rk808_clkout2_enable(hw, false);
}

static int rk808_clkout2_is_prepared(struct clk_hw *hw)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);
	uint32_t val;

	int ret = regmap_read(rk808_clkout->regmap, RK808_CLK32OUT_REG, &val);

	if (ret < 0)
		return ret;

	return (val & CLK32KOUT2_EN) ? 1 : 0;
}

static const struct clk_ops rk808_clkout1_ops = {
	.recalc_rate = rk808_clkout_recalc_rate,
};

static const struct clk_ops rk808_clkout2_ops = {
	.prepare = rk808_clkout2_prepare,
	.unprepare = rk808_clkout2_unprepare,
	.is_prepared = rk808_clkout2_is_prepared,
	.recalc_rate = rk808_clkout_recalc_rate,
};

static struct clk_hw *
of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
{
	struct rk808_clkout *rk808_clkout = data;
	unsigned int idx = clkspec->args[0];

	if (idx >= 2) {
		pr_err("%s: invalid index %u\n", __func__, idx);
		return ERR_PTR(-EINVAL);
	}

	return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
}

static int rk817_clkout2_enable(struct clk_hw *hw, bool enable)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);

	return regmap_update_bits(rk808_clkout->regmap, RK817_SYS_CFG(1),
				  RK817_CLK32KOUT2_EN,
				  enable ? RK817_CLK32KOUT2_EN : 0);
}

static int rk817_clkout2_prepare(struct clk_hw *hw)
{
	return rk817_clkout2_enable(hw, true);
}

static void rk817_clkout2_unprepare(struct clk_hw *hw)
{
	rk817_clkout2_enable(hw, false);
}

static int rk817_clkout2_is_prepared(struct clk_hw *hw)
{
	struct rk808_clkout *rk808_clkout = container_of(hw,
							 struct rk808_clkout,
							 clkout2_hw);
	unsigned int val;

	int ret = regmap_read(rk808_clkout->regmap, RK817_SYS_CFG(1), &val);

	if (ret < 0)
		return 0;

	return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
}

static const struct clk_ops rk817_clkout2_ops = {
	.prepare = rk817_clkout2_prepare,
	.unprepare = rk817_clkout2_unprepare,
	.is_prepared = rk817_clkout2_is_prepared,
	.recalc_rate = rk808_clkout_recalc_rate,
};

static const struct clk_ops *rkpmic_get_ops(long variant)
{
	switch (variant) {
	case RK809_ID:
	case RK817_ID:
		return &rk817_clkout2_ops;
	/*
	 * For the default case, it match the following PMIC type.
	 * RK805_ID
	 * RK808_ID
	 * RK818_ID
	 */
	default:
		return &rk808_clkout2_ops;
	}
}

static int rk808_clkout_probe(struct platform_device *pdev)
{
	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	struct device *dev = &pdev->dev;
	struct clk_init_data init = {};
	struct rk808_clkout *rk808_clkout;
	int ret;

	dev->of_node = pdev->dev.parent->of_node;

	rk808_clkout = devm_kzalloc(dev,
				    sizeof(*rk808_clkout), GFP_KERNEL);
	if (!rk808_clkout)
		return -ENOMEM;

	rk808_clkout->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!rk808_clkout->regmap)
		return -ENODEV;

	init.parent_names = NULL;
	init.num_parents = 0;
	init.name = "rk808-clkout1";
	init.ops = &rk808_clkout1_ops;
	rk808_clkout->clkout1_hw.init = &init;

	/* optional override of the clockname */
	of_property_read_string_index(dev->of_node, "clock-output-names",
				      0, &init.name);

	ret = devm_clk_hw_register(dev, &rk808_clkout->clkout1_hw);
	if (ret)
		return ret;

	init.name = "rk808-clkout2";
	init.ops = rkpmic_get_ops(rk808->variant);
	rk808_clkout->clkout2_hw.init = &init;

	/* optional override of the clockname */
	of_property_read_string_index(dev->of_node, "clock-output-names",
				      1, &init.name);

	ret = devm_clk_hw_register(dev, &rk808_clkout->clkout2_hw);
	if (ret)
		return ret;

	return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
					   rk808_clkout);
}

static struct platform_driver rk808_clkout_driver = {
	.probe = rk808_clkout_probe,
	.driver		= {
		.name	= "rk808-clkout",
	},
};

module_platform_driver(rk808_clkout_driver);

MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-clkout");
Commit	Line	Data
2025cf9e	1	// SPDX-License-Identifier: GPL-2.0-only
038b892a CZ	2	/*
	3	* Clkout driver for Rockchip RK808
	4	*
	5	* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
	6	*
	7	* Author:Chris Zhong <zyw@rock-chips.com>
038b892a CZ	8	*/
038b892a CZ	9
038b892a CZ	10	#include <linux/clk-provider.h>
	11	#include <linux/module.h>
	12	#include <linux/slab.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/mfd/rk808.h>
038b892a	15
038b892a	16	struct rk808_clkout {
2dc51ca8	17	struct regmap *regmap;
038b892a CZ	18	struct clk_hw clkout1_hw;
	19	struct clk_hw clkout2_hw;
	20	};
	21
	22	static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
	23	unsigned long parent_rate)
	24	{
	25	return 32768;
	26	}
	27
	28	static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
	29	{
	30	struct rk808_clkout *rk808_clkout = container_of(hw,
	31	struct rk808_clkout,
	32	clkout2_hw);
038b892a	33
2dc51ca8	34	return regmap_update_bits(rk808_clkout->regmap, RK808_CLK32OUT_REG,
038b892a CZ	35	CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
	36	}
	37
	38	static int rk808_clkout2_prepare(struct clk_hw *hw)
	39	{
	40	return rk808_clkout2_enable(hw, true);
	41	}
	42
	43	static void rk808_clkout2_unprepare(struct clk_hw *hw)
	44	{
	45	rk808_clkout2_enable(hw, false);
	46	}
	47
	48	static int rk808_clkout2_is_prepared(struct clk_hw *hw)
	49	{
	50	struct rk808_clkout *rk808_clkout = container_of(hw,
	51	struct rk808_clkout,
	52	clkout2_hw);
038b892a CZ	53	uint32_t val;
038b892a CZ	54
2dc51ca8	55	int ret = regmap_read(rk808_clkout->regmap, RK808_CLK32OUT_REG, &val);
038b892a CZ	56
	57	if (ret < 0)
	58	return ret;
	59
	60	return (val & CLK32KOUT2_EN) ? 1 : 0;
	61	}
	62
	63	static const struct clk_ops rk808_clkout1_ops = {
	64	.recalc_rate = rk808_clkout_recalc_rate,
	65	};
	66
	67	static const struct clk_ops rk808_clkout2_ops = {
	68	.prepare = rk808_clkout2_prepare,
	69	.unprepare = rk808_clkout2_unprepare,
	70	.is_prepared = rk808_clkout2_is_prepared,
	71	.recalc_rate = rk808_clkout_recalc_rate,
	72	};
	73
a8b6e85d SB	74	static struct clk_hw *
	75	of_clk_rk808_get(struct of_phandle_args clkspec, void data)
	76	{
	77	struct rk808_clkout *rk808_clkout = data;
	78	unsigned int idx = clkspec->args[0];
	79
	80	if (idx >= 2) {
	81	pr_err("%s: invalid index %u\n", __func__, idx);
	82	return ERR_PTR(-EINVAL);
	83	}
	84
	85	return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
	86	}
	87
8ed14401 TX	88	static int rk817_clkout2_enable(struct clk_hw *hw, bool enable)
	89	{
	90	struct rk808_clkout *rk808_clkout = container_of(hw,
	91	struct rk808_clkout,
	92	clkout2_hw);
8ed14401	93
2dc51ca8	94	return regmap_update_bits(rk808_clkout->regmap, RK817_SYS_CFG(1),
8ed14401 TX	95	RK817_CLK32KOUT2_EN,
	96	enable ? RK817_CLK32KOUT2_EN : 0);
	97	}
	98
	99	static int rk817_clkout2_prepare(struct clk_hw *hw)
	100	{
	101	return rk817_clkout2_enable(hw, true);
	102	}
	103
	104	static void rk817_clkout2_unprepare(struct clk_hw *hw)
	105	{
	106	rk817_clkout2_enable(hw, false);
	107	}
	108
	109	static int rk817_clkout2_is_prepared(struct clk_hw *hw)
	110	{
	111	struct rk808_clkout *rk808_clkout = container_of(hw,
	112	struct rk808_clkout,
	113	clkout2_hw);
8ed14401 TX	114	unsigned int val;
8ed14401 TX	115
2dc51ca8	116	int ret = regmap_read(rk808_clkout->regmap, RK817_SYS_CFG(1), &val);
8ed14401 TX	117
	118	if (ret < 0)
	119	return 0;
	120
	121	return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
	122	}
	123
	124	static const struct clk_ops rk817_clkout2_ops = {
	125	.prepare = rk817_clkout2_prepare,
	126	.unprepare = rk817_clkout2_unprepare,
	127	.is_prepared = rk817_clkout2_is_prepared,
	128	.recalc_rate = rk808_clkout_recalc_rate,
	129	};
	130
	131	static const struct clk_ops *rkpmic_get_ops(long variant)
	132	{
	133	switch (variant) {
	134	case RK809_ID:
	135	case RK817_ID:
	136	return &rk817_clkout2_ops;
	137	/*
	138	* For the default case, it match the following PMIC type.
	139	* RK805_ID
	140	* RK808_ID
	141	* RK818_ID
	142	*/
	143	default:
	144	return &rk808_clkout2_ops;
	145	}
	146	}
	147
038b892a CZ	148	static int rk808_clkout_probe(struct platform_device *pdev)
	149	{
	150	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
2dc51ca8	151	struct device *dev = &pdev->dev;
038b892a	152	struct clk_init_data init = {};
038b892a	153	struct rk808_clkout *rk808_clkout;
a8b6e85d	154	int ret;
038b892a	155
2dc51ca8 SR	156	dev->of_node = pdev->dev.parent->of_node;
	157
	158	rk808_clkout = devm_kzalloc(dev,
038b892a CZ	159	sizeof(*rk808_clkout), GFP_KERNEL);
	160	if (!rk808_clkout)
	161	return -ENOMEM;
	162
2dc51ca8 SR	163	rk808_clkout->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	164	if (!rk808_clkout->regmap)
	165	return -ENODEV;
038b892a	166
038b892a CZ	167	init.parent_names = NULL;
	168	init.num_parents = 0;
	169	init.name = "rk808-clkout1";
	170	init.ops = &rk808_clkout1_ops;
	171	rk808_clkout->clkout1_hw.init = &init;
	172
	173	/* optional override of the clockname */
2dc51ca8	174	of_property_read_string_index(dev->of_node, "clock-output-names",
038b892a CZ	175	0, &init.name);
038b892a CZ	176
2dc51ca8	177	ret = devm_clk_hw_register(dev, &rk808_clkout->clkout1_hw);
a8b6e85d SB	178	if (ret)
a8b6e85d SB	179	return ret;
038b892a CZ	180
038b892a CZ	181	init.name = "rk808-clkout2";
8ed14401	182	init.ops = rkpmic_get_ops(rk808->variant);
038b892a CZ	183	rk808_clkout->clkout2_hw.init = &init;
	184
	185	/* optional override of the clockname */
2dc51ca8	186	of_property_read_string_index(dev->of_node, "clock-output-names",
038b892a CZ	187	1, &init.name);
038b892a CZ	188
2dc51ca8	189	ret = devm_clk_hw_register(dev, &rk808_clkout->clkout2_hw);
a8b6e85d SB	190	if (ret)
a8b6e85d SB	191	return ret;
038b892a	192
25224667 MV	193	return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
25224667 MV	194	rk808_clkout);
038b892a CZ	195	}
	196
	197	static struct platform_driver rk808_clkout_driver = {
	198	.probe = rk808_clkout_probe,
038b892a CZ	199	.driver = {
	200	.name = "rk808-clkout",
	201	},
	202	};
	203
	204	module_platform_driver(rk808_clkout_driver);
	205
	206	MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
	207	MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
	208	MODULE_LICENSE("GPL");
	209	MODULE_ALIAS("platform:rk808-clkout");