[deliverable/linux.git] / drivers / clk / clk-s2mps11.c

/*
 * clk-s2mps11.c - Clock driver for S2MPS11.
 *
 * Copyright (C) 2013 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.
 *
 * 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/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/core.h>

#define s2mps11_name(a) (a->hw.init->name)

static struct clk **clk_table;
static struct clk_onecell_data clk_data;

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

struct s2mps11_clk {
	struct sec_pmic_dev *iodev;
	struct clk_hw hw;
	struct clk *clk;
	struct clk_lookup *lookup;
	u32 mask;
	bool enabled;
};

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);
	int ret;

	ret = regmap_update_bits(s2mps11->iodev->regmap,
				S2MPS11_REG_RTC_CTRL,
				 s2mps11->mask, s2mps11->mask);
	if (!ret)
		s2mps11->enabled = true;

	return ret;
}

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

	ret = regmap_update_bits(s2mps11->iodev->regmap, S2MPS11_REG_RTC_CTRL,
			   s2mps11->mask, ~s2mps11->mask);

	if (!ret)
		s2mps11->enabled = false;
}

static int s2mps11_clk_is_enabled(struct clk_hw *hw)
{
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);

	return s2mps11->enabled;
}

static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
					     unsigned long parent_rate)
{
	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
	if (s2mps11->enabled)
		return 32768;
	else
		return 0;
}

static struct clk_ops s2mps11_clk_ops = {
	.prepare	= s2mps11_clk_prepare,
	.unprepare	= s2mps11_clk_unprepare,
	.is_enabled	= s2mps11_clk_is_enabled,
	.recalc_rate	= s2mps11_clk_recalc_rate,
};

static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
	[S2MPS11_CLK_AP] = {
		.name = "s2mps11_ap",
		.ops = &s2mps11_clk_ops,
		.flags = CLK_IS_ROOT,
	},
	[S2MPS11_CLK_CP] = {
		.name = "s2mps11_cp",
		.ops = &s2mps11_clk_ops,
		.flags = CLK_IS_ROOT,
	},
	[S2MPS11_CLK_BT] = {
		.name = "s2mps11_bt",
		.ops = &s2mps11_clk_ops,
		.flags = CLK_IS_ROOT,
	},
};

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

	if (!iodev->dev->of_node)
		return NULL;

	clk_np = of_find_node_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);
	}

	clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) *
				 S2MPS11_CLKS_NUM, GFP_KERNEL);
	if (!clk_table)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < S2MPS11_CLKS_NUM; i++)
		of_property_read_string_index(clk_np, "clock-output-names", i,
				&s2mps11_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, *s2mps11_clk;
	struct device_node *clk_np = NULL;
	int i, ret = 0;
	u32 val;

	s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) *
					S2MPS11_CLKS_NUM, GFP_KERNEL);
	if (!s2mps11_clks)
		return -ENOMEM;

	s2mps11_clk = s2mps11_clks;

	clk_np = s2mps11_clk_parse_dt(pdev);
	if (IS_ERR(clk_np))
		return PTR_ERR(clk_np);

	for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
		s2mps11_clk->iodev = iodev;
		s2mps11_clk->hw.init = &s2mps11_clks_init[i];
		s2mps11_clk->mask = 1 << i;

		ret = regmap_read(s2mps11_clk->iodev->regmap,
				  S2MPS11_REG_RTC_CTRL, &val);
		if (ret < 0)
			goto err_reg;

		s2mps11_clk->enabled = val & s2mps11_clk->mask;

		s2mps11_clk->clk = devm_clk_register(&pdev->dev,
							&s2mps11_clk->hw);
		if (IS_ERR(s2mps11_clk->clk)) {
			dev_err(&pdev->dev, "Fail to register : %s\n",
						s2mps11_name(s2mps11_clk));
			ret = PTR_ERR(s2mps11_clk->clk);
			goto err_reg;
		}

		s2mps11_clk->lookup = devm_kzalloc(&pdev->dev,
					sizeof(struct clk_lookup), GFP_KERNEL);
		if (!s2mps11_clk->lookup) {
			ret = -ENOMEM;
			goto err_lup;
		}

		s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk);
		s2mps11_clk->lookup->clk = s2mps11_clk->clk;

		clkdev_add(s2mps11_clk->lookup);
	}

	if (clk_table) {
		for (i = 0; i < S2MPS11_CLKS_NUM; i++)
			clk_table[i] = s2mps11_clks[i].clk;

		clk_data.clks = clk_table;
		clk_data.clk_num = S2MPS11_CLKS_NUM;
		of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data);
	}

	platform_set_drvdata(pdev, s2mps11_clks);

	return ret;
err_lup:
	devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
err_reg:
	while (s2mps11_clk > s2mps11_clks) {
		if (s2mps11_clk->lookup) {
			clkdev_drop(s2mps11_clk->lookup);
			devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
		}
		s2mps11_clk--;
	}

	return ret;
}

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

	for (i = 0; i < S2MPS11_CLKS_NUM; i++)
		clkdev_drop(s2mps11_clks[i].lookup);

	return 0;
}

static const struct platform_device_id s2mps11_clk_id[] = {
	{ "s2mps11-clk", 0},
	{ },
};
MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);

static struct platform_driver s2mps11_clk_driver = {
	.driver = {
		.name  = "s2mps11-clk",
		.owner = THIS_MODULE,
	},
	.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 __init 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");
Commit	Line	Data
7cc560de YSB	1	/*
	2	* clk-s2mps11.c - Clock driver for S2MPS11.
	3	*
	4	* Copyright (C) 2013 Samsung Electornics
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/err.h>
	24	#include <linux/of.h>
	25	#include <linux/clkdev.h>
	26	#include <linux/regmap.h>
	27	#include <linux/clk-provider.h>
	28	#include <linux/platform_device.h>
	29	#include <linux/mfd/samsung/s2mps11.h>
	30	#include <linux/mfd/samsung/core.h>
	31
	32	#define s2mps11_name(a) (a->hw.init->name)
	33
	34	static struct clk **clk_table;
	35	static struct clk_onecell_data clk_data;
	36
	37	enum {
	38	S2MPS11_CLK_AP = 0,
	39	S2MPS11_CLK_CP,
	40	S2MPS11_CLK_BT,
	41	S2MPS11_CLKS_NUM,
	42	};
	43
	44	struct s2mps11_clk {
	45	struct sec_pmic_dev *iodev;
	46	struct clk_hw hw;
	47	struct clk *clk;
	48	struct clk_lookup *lookup;
	49	u32 mask;
	50	bool enabled;
	51	};
	52
	53	static struct s2mps11_clk to_s2mps11_clk(struct clk_hw hw)
	54	{
	55	return container_of(hw, struct s2mps11_clk, hw);
	56	}
	57
	58	static int s2mps11_clk_prepare(struct clk_hw *hw)
	59	{
	60	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
	61	int ret;
	62
	63	ret = regmap_update_bits(s2mps11->iodev->regmap,
	64	S2MPS11_REG_RTC_CTRL,
65	s2mps11->mask, s2mps11->mask);
66	if (!ret)
67	s2mps11->enabled = true;
68
69	return ret;
70	}
71
72	static void s2mps11_clk_unprepare(struct clk_hw *hw)
73	{
74	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
75	int ret;
76
77	ret = regmap_update_bits(s2mps11->iodev->regmap, S2MPS11_REG_RTC_CTRL,
78	s2mps11->mask, ~s2mps11->mask);
79
80	if (!ret)
81	s2mps11->enabled = false;
82	}
83
84	static int s2mps11_clk_is_enabled(struct clk_hw *hw)
85	{
86	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
87
88	return s2mps11->enabled;
89	}
90
91	static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
92	unsigned long parent_rate)
93	{
94	struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
95	if (s2mps11->enabled)
96	return 32768;
97	else
98	return 0;
99	}
100
101	static struct clk_ops s2mps11_clk_ops = {
102	.prepare = s2mps11_clk_prepare,
103	.unprepare = s2mps11_clk_unprepare,
104	.is_enabled = s2mps11_clk_is_enabled,
105	.recalc_rate = s2mps11_clk_recalc_rate,
106	};
107
108	static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
109	[S2MPS11_CLK_AP] = {
110	.name = "s2mps11_ap",
111	.ops = &s2mps11_clk_ops,
112	.flags = CLK_IS_ROOT,
113	},
114	[S2MPS11_CLK_CP] = {
115	.name = "s2mps11_cp",
116	.ops = &s2mps11_clk_ops,
117	.flags = CLK_IS_ROOT,
118	},
119	[S2MPS11_CLK_BT] = {
120	.name = "s2mps11_bt",
121	.ops = &s2mps11_clk_ops,
122	.flags = CLK_IS_ROOT,
123	},
124	};
125
126	static struct device_node s2mps11_clk_parse_dt(struct platform_device pdev)
127	{
128	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
129	struct device_node *clk_np;
130	int i;
131
132	if (!iodev->dev->of_node)
133	return NULL;
134
135	clk_np = of_find_node_by_name(iodev->dev->of_node, "clocks");
136	if (!clk_np) {
137	dev_err(&pdev->dev, "could not find clock sub-node\n");
138	return ERR_PTR(-EINVAL);
139	}
140
141	clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk )
142	S2MPS11_CLKS_NUM, GFP_KERNEL);
143	if (!clk_table)
144	return ERR_PTR(-ENOMEM);
145
146	for (i = 0; i < S2MPS11_CLKS_NUM; i++)
147	of_property_read_string_index(clk_np, "clock-output-names", i,
148	&s2mps11_clks_init[i].name);
149
150	return clk_np;
151	}
152
153	static int s2mps11_clk_probe(struct platform_device *pdev)
154	{
155	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
156	struct s2mps11_clk s2mps11_clks, s2mps11_clk;
157	struct device_node *clk_np = NULL;
158	int i, ret = 0;
159	u32 val;
160
161	s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(s2mps11_clk)
162	S2MPS11_CLKS_NUM, GFP_KERNEL);
163	if (!s2mps11_clks)
164	return -ENOMEM;
165
166	s2mps11_clk = s2mps11_clks;
167
168	clk_np = s2mps11_clk_parse_dt(pdev);
169	if (IS_ERR(clk_np))
170	return PTR_ERR(clk_np);
171
172	for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
173	s2mps11_clk->iodev = iodev;
174	s2mps11_clk->hw.init = &s2mps11_clks_init[i];
175	s2mps11_clk->mask = 1 << i;
176
177	ret = regmap_read(s2mps11_clk->iodev->regmap,
178	S2MPS11_REG_RTC_CTRL, &val);
179	if (ret < 0)
180	goto err_reg;
181
182	s2mps11_clk->enabled = val & s2mps11_clk->mask;
183
184	s2mps11_clk->clk = devm_clk_register(&pdev->dev,
185	&s2mps11_clk->hw);
186	if (IS_ERR(s2mps11_clk->clk)) {
187	dev_err(&pdev->dev, "Fail to register : %s\n",
188	s2mps11_name(s2mps11_clk));
189	ret = PTR_ERR(s2mps11_clk->clk);
190	goto err_reg;
191	}
192
193	s2mps11_clk->lookup = devm_kzalloc(&pdev->dev,
194	sizeof(struct clk_lookup), GFP_KERNEL);
195	if (!s2mps11_clk->lookup) {
196	ret = -ENOMEM;
197	goto err_lup;
198	}
199
200	s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk);
201	s2mps11_clk->lookup->clk = s2mps11_clk->clk;
202
203	clkdev_add(s2mps11_clk->lookup);
204	}
205
206	if (clk_table) {
207	for (i = 0; i < S2MPS11_CLKS_NUM; i++)
208	clk_table[i] = s2mps11_clks[i].clk;
209
210	clk_data.clks = clk_table;
211	clk_data.clk_num = S2MPS11_CLKS_NUM;
212	of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data);
213	}
214
215	platform_set_drvdata(pdev, s2mps11_clks);
216
217	return ret;
218	err_lup:
219	devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
220	err_reg:
221	while (s2mps11_clk > s2mps11_clks) {
222	if (s2mps11_clk->lookup) {
223	clkdev_drop(s2mps11_clk->lookup);
224	devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
225	}
226	s2mps11_clk--;
227	}
228
229	return ret;
230	}
231
232	static int s2mps11_clk_remove(struct platform_device *pdev)
233	{
234	struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
235	int i;
236
237	for (i = 0; i < S2MPS11_CLKS_NUM; i++)
238	clkdev_drop(s2mps11_clks[i].lookup);
239
240	return 0;
241	}
242
243	static const struct platform_device_id s2mps11_clk_id[] = {
244	{ "s2mps11-clk", 0},
245	{ },
246	};
247	MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
248
249	static struct platform_driver s2mps11_clk_driver = {
250	.driver = {
251	.name = "s2mps11-clk",
252	.owner = THIS_MODULE,
253	},
254	.probe = s2mps11_clk_probe,
255	.remove = s2mps11_clk_remove,
256	.id_table = s2mps11_clk_id,
257	};
258
259	static int __init s2mps11_clk_init(void)
260	{
261	return platform_driver_register(&s2mps11_clk_driver);
262	}
263	subsys_initcall(s2mps11_clk_init);
264
265	static void __init s2mps11_clk_cleanup(void)
266	{
267	platform_driver_unregister(&s2mps11_clk_driver);
268	}
269	module_exit(s2mps11_clk_cleanup);
270
271	MODULE_DESCRIPTION("S2MPS11 Clock Driver");
272	MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
273	MODULE_LICENSE("GPL");