[linux-block.git] / drivers / clk / clk-cs2000-cp.c

/*
 * CS2000  --  CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier
 *
 * Copyright (C) 2015 Renesas Electronics Corporation
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.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-provider.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include <linux/module.h>

#define CH_MAX 4
#define RATIO_REG_SIZE 4

#define DEVICE_ID	0x1
#define DEVICE_CTRL	0x2
#define DEVICE_CFG1	0x3
#define DEVICE_CFG2	0x4
#define GLOBAL_CFG	0x5
#define Ratio_Add(x, nth)	(6 + (x * 4) + (nth))
#define Ratio_Val(x, nth)	((x >> (24 - (8 * nth))) & 0xFF)
#define Val_Ratio(x, nth)	((x & 0xFF) << (24 - (8 * nth)))
#define FUNC_CFG1	0x16
#define FUNC_CFG2	0x17

/* DEVICE_ID */
#define REVISION_MASK	(0x7)
#define REVISION_B2_B3	(0x4)
#define REVISION_C1	(0x6)

/* DEVICE_CTRL */
#define PLL_UNLOCK	(1 << 7)

/* DEVICE_CFG1 */
#define RSEL(x)		(((x) & 0x3) << 3)
#define RSEL_MASK	RSEL(0x3)
#define ENDEV1		(0x1)

/* GLOBAL_CFG */
#define ENDEV2		(0x1)

#define CH_SIZE_ERR(ch)		((ch < 0) || (ch >= CH_MAX))
#define hw_to_priv(_hw)		container_of(_hw, struct cs2000_priv, hw)
#define priv_to_client(priv)	(priv->client)
#define priv_to_dev(priv)	(&(priv_to_client(priv)->dev))

#define CLK_IN	0
#define REF_CLK	1
#define CLK_MAX 2

struct cs2000_priv {
	struct clk_hw hw;
	struct i2c_client *client;
	struct clk *clk_in;
	struct clk *ref_clk;

	/* suspend/resume */
	unsigned long saved_rate;
	unsigned long saved_parent_rate;
};

static const struct of_device_id cs2000_of_match[] = {
	{ .compatible = "cirrus,cs2000-cp", },
	{},
};
MODULE_DEVICE_TABLE(of, cs2000_of_match);

static const struct i2c_device_id cs2000_id[] = {
	{ "cs2000-cp", },
	{}
};
MODULE_DEVICE_TABLE(i2c, cs2000_id);

#define cs2000_read(priv, addr) \
	i2c_smbus_read_byte_data(priv_to_client(priv), addr)
#define cs2000_write(priv, addr, val) \
	i2c_smbus_write_byte_data(priv_to_client(priv), addr, val)

static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val)
{
	s32 data;

	data = cs2000_read(priv, addr);
	if (data < 0)
		return data;

	data &= ~mask;
	data |= (val & mask);

	return cs2000_write(priv, addr, data);
}

static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable)
{
	int ret;

	ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1,
			  enable ? ENDEV1 : 0);
	if (ret < 0)
		return ret;

	ret = cs2000_bset(priv, GLOBAL_CFG,  ENDEV2,
			  enable ? ENDEV2 : 0);
	if (ret < 0)
		return ret;

	return 0;
}

static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv,
				    u32 rate_in)
{
	u32 val;

	if (rate_in >= 32000000 && rate_in < 56000000)
		val = 0x0;
	else if (rate_in >= 16000000 && rate_in < 28000000)
		val = 0x1;
	else if (rate_in >= 8000000 && rate_in < 14000000)
		val = 0x2;
	else
		return -EINVAL;

	return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3);
}

static int cs2000_wait_pll_lock(struct cs2000_priv *priv)
{
	struct device *dev = priv_to_dev(priv);
	s32 val;
	unsigned int i;

	for (i = 0; i < 256; i++) {
		val = cs2000_read(priv, DEVICE_CTRL);
		if (val < 0)
			return val;
		if (!(val & PLL_UNLOCK))
			return 0;
		udelay(1);
	}

	dev_err(dev, "pll lock failed\n");

	return -ETIMEDOUT;
}

static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable)
{
	/* enable both AUX_OUT, CLK_OUT */
	return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3);
}

static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out)
{
	u64 ratio;

	/*
	 * ratio = rate_out / rate_in * 2^20
	 *
	 * To avoid over flow, rate_out is u64.
	 * The result should be u32.
	 */
	ratio = (u64)rate_out << 20;
	do_div(ratio, rate_in);

	return ratio;
}

static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in)
{
	u64 rate_out;

	/*
	 * ratio = rate_out / rate_in * 2^20
	 *
	 * To avoid over flow, rate_out is u64.
	 * The result should be u32 or unsigned long.
	 */

	rate_out = (u64)ratio * rate_in;
	return rate_out >> 20;
}

static int cs2000_ratio_set(struct cs2000_priv *priv,
			    int ch, u32 rate_in, u32 rate_out)
{
	u32 val;
	unsigned int i;
	int ret;

	if (CH_SIZE_ERR(ch))
		return -EINVAL;

	val = cs2000_rate_to_ratio(rate_in, rate_out);
	for (i = 0; i < RATIO_REG_SIZE; i++) {
		ret = cs2000_write(priv,
				   Ratio_Add(ch, i),
				   Ratio_Val(val, i));
		if (ret < 0)
			return ret;
	}

	return 0;
}

static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch)
{
	s32 tmp;
	u32 val;
	unsigned int i;

	val = 0;
	for (i = 0; i < RATIO_REG_SIZE; i++) {
		tmp = cs2000_read(priv, Ratio_Add(ch, i));
		if (tmp < 0)
			return 0;

		val |= Val_Ratio(tmp, i);
	}

	return val;
}

static int cs2000_ratio_select(struct cs2000_priv *priv, int ch)
{
	int ret;

	if (CH_SIZE_ERR(ch))
		return -EINVAL;

	/*
	 * FIXME
	 *
	 * this driver supports static ratio mode only at this point.
	 */
	ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch));
	if (ret < 0)
		return ret;

	ret = cs2000_write(priv, DEVICE_CFG2, 0x0);
	if (ret < 0)
		return ret;

	return 0;
}

static unsigned long cs2000_recalc_rate(struct clk_hw *hw,
					unsigned long parent_rate)
{
	struct cs2000_priv *priv = hw_to_priv(hw);
	int ch = 0; /* it uses ch0 only at this point */
	u32 ratio;

	ratio = cs2000_ratio_get(priv, ch);

	return cs2000_ratio_to_rate(ratio, parent_rate);
}

static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate,
			      unsigned long *parent_rate)
{
	u32 ratio;

	ratio = cs2000_rate_to_ratio(*parent_rate, rate);

	return cs2000_ratio_to_rate(ratio, *parent_rate);
}

static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
			     unsigned long rate, unsigned long parent_rate)

{
	int ret;

	ret = cs2000_clk_in_bound_rate(priv, parent_rate);
	if (ret < 0)
		return ret;

	ret = cs2000_ratio_set(priv, ch, parent_rate, rate);
	if (ret < 0)
		return ret;

	ret = cs2000_ratio_select(priv, ch);
	if (ret < 0)
		return ret;

	priv->saved_rate	= rate;
	priv->saved_parent_rate	= parent_rate;

	return 0;
}

static int cs2000_set_rate(struct clk_hw *hw,
			   unsigned long rate, unsigned long parent_rate)
{
	struct cs2000_priv *priv = hw_to_priv(hw);
	int ch = 0; /* it uses ch0 only at this point */

	return __cs2000_set_rate(priv, ch, rate, parent_rate);
}

static int cs2000_enable(struct clk_hw *hw)
{
	struct cs2000_priv *priv = hw_to_priv(hw);
	int ret;

	ret = cs2000_enable_dev_config(priv, true);
	if (ret < 0)
		return ret;

	ret = cs2000_clk_out_enable(priv, true);
	if (ret < 0)
		return ret;

	ret = cs2000_wait_pll_lock(priv);
	if (ret < 0)
		return ret;

	return ret;
}

static void cs2000_disable(struct clk_hw *hw)
{
	struct cs2000_priv *priv = hw_to_priv(hw);

	cs2000_enable_dev_config(priv, false);

	cs2000_clk_out_enable(priv, false);
}

static u8 cs2000_get_parent(struct clk_hw *hw)
{
	/* always return REF_CLK */
	return REF_CLK;
}

static const struct clk_ops cs2000_ops = {
	.get_parent	= cs2000_get_parent,
	.recalc_rate	= cs2000_recalc_rate,
	.round_rate	= cs2000_round_rate,
	.set_rate	= cs2000_set_rate,
	.prepare	= cs2000_enable,
	.unprepare	= cs2000_disable,
};

static int cs2000_clk_get(struct cs2000_priv *priv)
{
	struct i2c_client *client = priv_to_client(priv);
	struct device *dev = &client->dev;
	struct clk *clk_in, *ref_clk;

	clk_in = devm_clk_get(dev, "clk_in");
	/* not yet provided */
	if (IS_ERR(clk_in))
		return -EPROBE_DEFER;

	ref_clk = devm_clk_get(dev, "ref_clk");
	/* not yet provided */
	if (IS_ERR(ref_clk))
		return -EPROBE_DEFER;

	priv->clk_in	= clk_in;
	priv->ref_clk	= ref_clk;

	return 0;
}

static int cs2000_clk_register(struct cs2000_priv *priv)
{
	struct device *dev = priv_to_dev(priv);
	struct device_node *np = dev->of_node;
	struct clk_init_data init;
	const char *name = np->name;
	static const char *parent_names[CLK_MAX];
	int ch = 0; /* it uses ch0 only at this point */
	int rate;
	int ret;

	of_property_read_string(np, "clock-output-names", &name);

	/*
	 * set default rate as 1/1.
	 * otherwise .set_rate which setup ratio
	 * is never called if user requests 1/1 rate
	 */
	rate = clk_get_rate(priv->ref_clk);
	ret = __cs2000_set_rate(priv, ch, rate, rate);
	if (ret < 0)
		return ret;

	parent_names[CLK_IN]	= __clk_get_name(priv->clk_in);
	parent_names[REF_CLK]	= __clk_get_name(priv->ref_clk);

	init.name		= name;
	init.ops		= &cs2000_ops;
	init.flags		= CLK_SET_RATE_GATE;
	init.parent_names	= parent_names;
	init.num_parents	= ARRAY_SIZE(parent_names);

	priv->hw.init = &init;

	ret = clk_hw_register(dev, &priv->hw);
	if (ret)
		return ret;

	ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &priv->hw);
	if (ret < 0) {
		clk_hw_unregister(&priv->hw);
		return ret;
	}

	return 0;
}

static int cs2000_version_print(struct cs2000_priv *priv)
{
	struct i2c_client *client = priv_to_client(priv);
	struct device *dev = &client->dev;
	s32 val;
	const char *revision;

	val = cs2000_read(priv, DEVICE_ID);
	if (val < 0)
		return val;

	/* CS2000 should be 0x0 */
	if (val >> 3)
		return -EIO;

	switch (val & REVISION_MASK) {
	case REVISION_B2_B3:
		revision = "B2 / B3";
		break;
	case REVISION_C1:
		revision = "C1";
		break;
	default:
		return -EIO;
	}

	dev_info(dev, "revision - %s\n", revision);

	return 0;
}

static int cs2000_remove(struct i2c_client *client)
{
	struct cs2000_priv *priv = i2c_get_clientdata(client);
	struct device *dev = &client->dev;
	struct device_node *np = dev->of_node;

	of_clk_del_provider(np);

	clk_hw_unregister(&priv->hw);

	return 0;
}

static int cs2000_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct cs2000_priv *priv;
	struct device *dev = &client->dev;
	int ret;

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

	priv->client = client;
	i2c_set_clientdata(client, priv);

	ret = cs2000_clk_get(priv);
	if (ret < 0)
		return ret;

	ret = cs2000_clk_register(priv);
	if (ret < 0)
		return ret;

	ret = cs2000_version_print(priv);
	if (ret < 0)
		goto probe_err;

	return 0;

probe_err:
	cs2000_remove(client);

	return ret;
}

static int cs2000_resume(struct device *dev)
{
	struct cs2000_priv *priv = dev_get_drvdata(dev);
	int ch = 0; /* it uses ch0 only at this point */

	return __cs2000_set_rate(priv, ch,
				 priv->saved_rate,
				 priv->saved_parent_rate);
}

static const struct dev_pm_ops cs2000_pm_ops = {
	.resume_early	= cs2000_resume,
};

static struct i2c_driver cs2000_driver = {
	.driver = {
		.name = "cs2000-cp",
		.pm	= &cs2000_pm_ops,
		.of_match_table = cs2000_of_match,
	},
	.probe		= cs2000_probe,
	.remove		= cs2000_remove,
	.id_table	= cs2000_id,
};

module_i2c_driver(cs2000_driver);

MODULE_DESCRIPTION("CS2000-CP driver");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
64dfbe24 KM	1	/*
	2	* CS2000 -- CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier
	3	*
	4	* Copyright (C) 2015 Renesas Electronics Corporation
	5	* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/clk-provider.h>
	12	#include <linux/delay.h>
	13	#include <linux/clk.h>
	14	#include <linux/i2c.h>
	15	#include <linux/of_device.h>
	16	#include <linux/module.h>
	17
	18	#define CH_MAX 4
	19	#define RATIO_REG_SIZE 4
	20
	21	#define DEVICE_ID 0x1
	22	#define DEVICE_CTRL 0x2
	23	#define DEVICE_CFG1 0x3
	24	#define DEVICE_CFG2 0x4
	25	#define GLOBAL_CFG 0x5
	26	#define Ratio_Add(x, nth) (6 + (x * 4) + (nth))
	27	#define Ratio_Val(x, nth) ((x >> (24 - (8 * nth))) & 0xFF)
	28	#define Val_Ratio(x, nth) ((x & 0xFF) << (24 - (8 * nth)))
	29	#define FUNC_CFG1 0x16
	30	#define FUNC_CFG2 0x17
	31
	32	/* DEVICE_ID */
	33	#define REVISION_MASK (0x7)
	34	#define REVISION_B2_B3 (0x4)
	35	#define REVISION_C1 (0x6)
	36
	37	/* DEVICE_CTRL */
	38	#define PLL_UNLOCK (1 << 7)
	39
	40	/* DEVICE_CFG1 */
	41	#define RSEL(x) (((x) & 0x3) << 3)
	42	#define RSEL_MASK RSEL(0x3)
	43	#define ENDEV1 (0x1)
	44
	45	/* GLOBAL_CFG */
	46	#define ENDEV2 (0x1)
	47
	48	#define CH_SIZE_ERR(ch) ((ch < 0) \|\| (ch >= CH_MAX))
	49	#define hw_to_priv(_hw) container_of(_hw, struct cs2000_priv, hw)
	50	#define priv_to_client(priv) (priv->client)
	51	#define priv_to_dev(priv) (&(priv_to_client(priv)->dev))
	52
	53	#define CLK_IN 0
	54	#define REF_CLK 1
	55	#define CLK_MAX 2
	56
	57	struct cs2000_priv {
	58	struct clk_hw hw;
	59	struct i2c_client *client;
	60	struct clk *clk_in;
	61	struct clk *ref_clk;
c567fb37 KN	62
	63	/* suspend/resume */
	64	unsigned long saved_rate;
	65	unsigned long saved_parent_rate;
64dfbe24 KM	66	};
	67
	68	static const struct of_device_id cs2000_of_match[] = {
	69	{ .compatible = "cirrus,cs2000-cp", },
	70	{},
	71	};
	72	MODULE_DEVICE_TABLE(of, cs2000_of_match);
	73
	74	static const struct i2c_device_id cs2000_id[] = {
	75	{ "cs2000-cp", },
	76	{}
	77	};
	78	MODULE_DEVICE_TABLE(i2c, cs2000_id);
	79
	80	#define cs2000_read(priv, addr) \
	81	i2c_smbus_read_byte_data(priv_to_client(priv), addr)
	82	#define cs2000_write(priv, addr, val) \
	83	i2c_smbus_write_byte_data(priv_to_client(priv), addr, val)
	84
	85	static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val)
	86	{
	87	s32 data;
	88
	89	data = cs2000_read(priv, addr);
	90	if (data < 0)
	91	return data;
	92
	93	data &= ~mask;
	94	data \|= (val & mask);
	95
	96	return cs2000_write(priv, addr, data);
	97	}
	98
	99	static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable)
	100	{
	101	int ret;
	102
	103	ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1,
	104	enable ? ENDEV1 : 0);
	105	if (ret < 0)
	106	return ret;
	107
	108	ret = cs2000_bset(priv, GLOBAL_CFG, ENDEV2,
	109	enable ? ENDEV2 : 0);
	110	if (ret < 0)
	111	return ret;
	112
	113	return 0;
	114	}
	115
	116	static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv,
	117	u32 rate_in)
	118	{
	119	u32 val;
	120
	121	if (rate_in >= 32000000 && rate_in < 56000000)
	122	val = 0x0;
	123	else if (rate_in >= 16000000 && rate_in < 28000000)
	124	val = 0x1;
	125	else if (rate_in >= 8000000 && rate_in < 14000000)
	126	val = 0x2;
	127	else
	128	return -EINVAL;
	129
130	return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3);
131	}
132
133	static int cs2000_wait_pll_lock(struct cs2000_priv *priv)
134	{
135	struct device *dev = priv_to_dev(priv);
136	s32 val;
137	unsigned int i;
138
139	for (i = 0; i < 256; i++) {
140	val = cs2000_read(priv, DEVICE_CTRL);
141	if (val < 0)
142	return val;
143	if (!(val & PLL_UNLOCK))
144	return 0;
145	udelay(1);
146	}
147
148	dev_err(dev, "pll lock failed\n");
149
150	return -ETIMEDOUT;
151	}
152
153	static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable)
154	{
155	/* enable both AUX_OUT, CLK_OUT */
156	return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3);
157	}
158
159	static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out)
160	{
161	u64 ratio;
162
163	/*
164	* ratio = rate_out / rate_in * 2^20
165	*
166	* To avoid over flow, rate_out is u64.
167	* The result should be u32.
168	*/
169	ratio = (u64)rate_out << 20;
170	do_div(ratio, rate_in);
171
172	return ratio;
173	}
174
175	static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in)
176	{
177	u64 rate_out;
178
179	/*
180	* ratio = rate_out / rate_in * 2^20
181	*
182	* To avoid over flow, rate_out is u64.
183	* The result should be u32 or unsigned long.
184	*/
185
186	rate_out = (u64)ratio * rate_in;
187	return rate_out >> 20;
188	}
189
190	static int cs2000_ratio_set(struct cs2000_priv *priv,
191	int ch, u32 rate_in, u32 rate_out)
192	{
193	u32 val;
194	unsigned int i;
195	int ret;
196
197	if (CH_SIZE_ERR(ch))
198	return -EINVAL;
199
200	val = cs2000_rate_to_ratio(rate_in, rate_out);
201	for (i = 0; i < RATIO_REG_SIZE; i++) {
202	ret = cs2000_write(priv,
203	Ratio_Add(ch, i),
204	Ratio_Val(val, i));
205	if (ret < 0)
206	return ret;
207	}
208
209	return 0;
210	}
211
212	static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch)
213	{
214	s32 tmp;
215	u32 val;
216	unsigned int i;
217
218	val = 0;
219	for (i = 0; i < RATIO_REG_SIZE; i++) {
220	tmp = cs2000_read(priv, Ratio_Add(ch, i));
221	if (tmp < 0)
222	return 0;
223
224	val \|= Val_Ratio(tmp, i);
225	}
226
227	return val;
228	}
229
230	static int cs2000_ratio_select(struct cs2000_priv *priv, int ch)
231	{
232	int ret;
233
234	if (CH_SIZE_ERR(ch))
235	return -EINVAL;
236
237	/*
238	* FIXME
239	*
240	* this driver supports static ratio mode only at this point.
241	*/
242	ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch));
243	if (ret < 0)
244	return ret;
245
246	ret = cs2000_write(priv, DEVICE_CFG2, 0x0);
247	if (ret < 0)
248	return ret;
249
250	return 0;
251	}
252
253	static unsigned long cs2000_recalc_rate(struct clk_hw *hw,
254	unsigned long parent_rate)
255	{
256	struct cs2000_priv *priv = hw_to_priv(hw);
257	int ch = 0; /* it uses ch0 only at this point */
258	u32 ratio;
259
260	ratio = cs2000_ratio_get(priv, ch);
261
262	return cs2000_ratio_to_rate(ratio, parent_rate);
263	}
264
265	static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate,
266	unsigned long *parent_rate)
267	{
268	u32 ratio;
269
270	ratio = cs2000_rate_to_ratio(*parent_rate, rate);
271
272	return cs2000_ratio_to_rate(ratio, *parent_rate);
273	}
274
275	static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
276	unsigned long rate, unsigned long parent_rate)
277
278	{
279	int ret;
280
281	ret = cs2000_clk_in_bound_rate(priv, parent_rate);
282	if (ret < 0)
283	return ret;
284
285	ret = cs2000_ratio_set(priv, ch, parent_rate, rate);
286	if (ret < 0)
287	return ret;
288
289	ret = cs2000_ratio_select(priv, ch);
290	if (ret < 0)
291	return ret;
292
c567fb37 KN	293	priv->saved_rate = rate;
	294	priv->saved_parent_rate = parent_rate;
	295
64dfbe24 KM	296	return 0;
	297	}
	298
	299	static int cs2000_set_rate(struct clk_hw *hw,
	300	unsigned long rate, unsigned long parent_rate)
	301	{
	302	struct cs2000_priv *priv = hw_to_priv(hw);
	303	int ch = 0; /* it uses ch0 only at this point */
	304
	305	return __cs2000_set_rate(priv, ch, rate, parent_rate);
	306	}
	307
	308	static int cs2000_enable(struct clk_hw *hw)
	309	{
	310	struct cs2000_priv *priv = hw_to_priv(hw);
	311	int ret;
	312
	313	ret = cs2000_enable_dev_config(priv, true);
	314	if (ret < 0)
	315	return ret;
	316
	317	ret = cs2000_clk_out_enable(priv, true);
	318	if (ret < 0)
	319	return ret;
	320
	321	ret = cs2000_wait_pll_lock(priv);
	322	if (ret < 0)
	323	return ret;
	324
	325	return ret;
	326	}
	327
	328	static void cs2000_disable(struct clk_hw *hw)
	329	{
	330	struct cs2000_priv *priv = hw_to_priv(hw);
	331
	332	cs2000_enable_dev_config(priv, false);
	333
	334	cs2000_clk_out_enable(priv, false);
	335	}
	336
	337	static u8 cs2000_get_parent(struct clk_hw *hw)
	338	{
	339	/* always return REF_CLK */
	340	return REF_CLK;
	341	}
	342
	343	static const struct clk_ops cs2000_ops = {
	344	.get_parent = cs2000_get_parent,
	345	.recalc_rate = cs2000_recalc_rate,
	346	.round_rate = cs2000_round_rate,
	347	.set_rate = cs2000_set_rate,
	348	.prepare = cs2000_enable,
	349	.unprepare = cs2000_disable,
	350	};
	351
	352	static int cs2000_clk_get(struct cs2000_priv *priv)
	353	{
	354	struct i2c_client *client = priv_to_client(priv);
	355	struct device *dev = &client->dev;
	356	struct clk clk_in, ref_clk;
	357
	358	clk_in = devm_clk_get(dev, "clk_in");
	359	/* not yet provided */
360	if (IS_ERR(clk_in))
361	return -EPROBE_DEFER;
362
363	ref_clk = devm_clk_get(dev, "ref_clk");
364	/* not yet provided */
365	if (IS_ERR(ref_clk))
366	return -EPROBE_DEFER;
367
368	priv->clk_in = clk_in;
369	priv->ref_clk = ref_clk;
370
371	return 0;
372	}
373
374	static int cs2000_clk_register(struct cs2000_priv *priv)
375	{
376	struct device *dev = priv_to_dev(priv);
377	struct device_node *np = dev->of_node;
378	struct clk_init_data init;
379	const char *name = np->name;
64dfbe24 KM	380	static const char *parent_names[CLK_MAX];
	381	int ch = 0; /* it uses ch0 only at this point */
	382	int rate;
	383	int ret;
	384
	385	of_property_read_string(np, "clock-output-names", &name);
	386
	387	/*
	388	* set default rate as 1/1.
	389	* otherwise .set_rate which setup ratio
	390	* is never called if user requests 1/1 rate
	391	*/
	392	rate = clk_get_rate(priv->ref_clk);
	393	ret = __cs2000_set_rate(priv, ch, rate, rate);
	394	if (ret < 0)
	395	return ret;
	396
	397	parent_names[CLK_IN] = __clk_get_name(priv->clk_in);
	398	parent_names[REF_CLK] = __clk_get_name(priv->ref_clk);
	399
	400	init.name = name;
	401	init.ops = &cs2000_ops;
	402	init.flags = CLK_SET_RATE_GATE;
	403	init.parent_names = parent_names;
	404	init.num_parents = ARRAY_SIZE(parent_names);
	405
	406	priv->hw.init = &init;
	407
2ceb3c7a SB	408	ret = clk_hw_register(dev, &priv->hw);
	409	if (ret)
	410	return ret;
64dfbe24	411
2ceb3c7a	412	ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &priv->hw);
64dfbe24	413	if (ret < 0) {
2ceb3c7a	414	clk_hw_unregister(&priv->hw);
64dfbe24 KM	415	return ret;
	416	}
	417
64dfbe24 KM	418	return 0;
	419	}
	420
	421	static int cs2000_version_print(struct cs2000_priv *priv)
	422	{
	423	struct i2c_client *client = priv_to_client(priv);
	424	struct device *dev = &client->dev;
	425	s32 val;
	426	const char *revision;
	427
	428	val = cs2000_read(priv, DEVICE_ID);
	429	if (val < 0)
	430	return val;
	431
	432	/* CS2000 should be 0x0 */
	433	if (val >> 3)
	434	return -EIO;
	435
	436	switch (val & REVISION_MASK) {
	437	case REVISION_B2_B3:
	438	revision = "B2 / B3";
	439	break;
	440	case REVISION_C1:
	441	revision = "C1";
	442	break;
	443	default:
	444	return -EIO;
	445	}
	446
	447	dev_info(dev, "revision - %s\n", revision);
	448
	449	return 0;
	450	}
	451
	452	static int cs2000_remove(struct i2c_client *client)
	453	{
	454	struct cs2000_priv *priv = i2c_get_clientdata(client);
	455	struct device *dev = &client->dev;
	456	struct device_node *np = dev->of_node;
	457
	458	of_clk_del_provider(np);
	459
2ceb3c7a	460	clk_hw_unregister(&priv->hw);
64dfbe24 KM	461
	462	return 0;
	463	}
	464
	465	static int cs2000_probe(struct i2c_client *client,
	466	const struct i2c_device_id *id)
	467	{
	468	struct cs2000_priv *priv;
	469	struct device *dev = &client->dev;
	470	int ret;
	471
	472	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	473	if (!priv)
	474	return -ENOMEM;
	475
	476	priv->client = client;
	477	i2c_set_clientdata(client, priv);
	478
	479	ret = cs2000_clk_get(priv);
	480	if (ret < 0)
	481	return ret;
	482
	483	ret = cs2000_clk_register(priv);
	484	if (ret < 0)
	485	return ret;
	486
	487	ret = cs2000_version_print(priv);
	488	if (ret < 0)
	489	goto probe_err;
	490
	491	return 0;
	492
	493	probe_err:
	494	cs2000_remove(client);
	495
	496	return ret;
	497	}
	498
c567fb37 KN	499	static int cs2000_resume(struct device *dev)
	500	{
	501	struct cs2000_priv *priv = dev_get_drvdata(dev);
	502	int ch = 0; /* it uses ch0 only at this point */
	503
	504	return __cs2000_set_rate(priv, ch,
	505	priv->saved_rate,
	506	priv->saved_parent_rate);
	507	}
	508
	509	static const struct dev_pm_ops cs2000_pm_ops = {
	510	.resume_early = cs2000_resume,
	511	};
	512
64dfbe24 KM	513	static struct i2c_driver cs2000_driver = {
	514	.driver = {
	515	.name = "cs2000-cp",
c567fb37	516	.pm = &cs2000_pm_ops,
64dfbe24 KM	517	.of_match_table = cs2000_of_match,
	518	},
	519	.probe = cs2000_probe,
	520	.remove = cs2000_remove,
	521	.id_table = cs2000_id,
	522	};
	523
	524	module_i2c_driver(cs2000_driver);
	525
	526	MODULE_DESCRIPTION("CS2000-CP driver");
	527	MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
	528	MODULE_LICENSE("GPL v2");