[linux-2.6-block.git] / drivers / regulator / lp87565-regulator.c

/*
 * Regulator driver for LP87565 PMIC
 *
 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.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 version 2. 
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <linux/mfd/lp87565.h>

#define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
			 _delay, _lr, _cr)				\
	[_id] = {							\
		.desc = {						\
			.name			= _name,		\
			.supply_name		= _of "-in",		\
			.id			= _id,			\
			.of_match		= of_match_ptr(_of),	\
			.regulators_node	= of_match_ptr("regulators"),\
			.ops			= &_ops,		\
			.n_voltages		= _n,			\
			.type			= REGULATOR_VOLTAGE,	\
			.owner			= THIS_MODULE,		\
			.vsel_reg		= _vr,			\
			.vsel_mask		= _vm,			\
			.enable_reg		= _er,			\
			.enable_mask		= _em,			\
			.ramp_delay		= _delay,		\
			.linear_ranges		= _lr,			\
			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
		},							\
		.ctrl2_reg = _cr,					\
	}

struct lp87565_regulator {
	struct regulator_desc desc;
	unsigned int ctrl2_reg;
};

static const struct lp87565_regulator regulators[];

static const struct regulator_linear_range buck0_1_2_3_ranges[] = {
	REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
};

static unsigned int lp87565_buck_ramp_delay[] = {
	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
};

/* LP87565 BUCK current limit */
static const unsigned int lp87565_buck_uA[] = {
	1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
};

static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
				       int ramp_delay)
{
	int id = rdev_get_id(rdev);
	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
	unsigned int reg;
	int ret;

	if (ramp_delay <= 470)
		reg = 7;
	else if (ramp_delay <= 940)
		reg = 6;
	else if (ramp_delay <= 1900)
		reg = 5;
	else if (ramp_delay <= 3800)
		reg = 4;
	else if (ramp_delay <= 7500)
		reg = 3;
	else if (ramp_delay <= 10000)
		reg = 2;
	else if (ramp_delay <= 15000)
		reg = 1;
	else
		reg = 0;

	ret = regmap_update_bits(lp87565->regmap, regulators[id].ctrl2_reg,
				 LP87565_BUCK_CTRL_2_SLEW_RATE,
				 reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
	if (ret) {
		dev_err(lp87565->dev, "SLEW RATE write failed: %d\n", ret);
		return ret;
	}

	rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];

	/* Conservatively give a 15% margin */
	rdev->constraints->ramp_delay =
				rdev->constraints->ramp_delay * 85 / 100;

	return 0;
}

static int lp87565_buck_set_current_limit(struct regulator_dev *rdev,
					  int min_uA, int max_uA)
{
	int id = rdev_get_id(rdev);
	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
	int i;

	for (i = ARRAY_SIZE(lp87565_buck_uA) - 1; i >= 0; i--) {
		if (lp87565_buck_uA[i] >= min_uA &&
		    lp87565_buck_uA[i] <= max_uA)
			return regmap_update_bits(lp87565->regmap,
						  regulators[id].ctrl2_reg,
						  LP87565_BUCK_CTRL_2_ILIM,
						  i << __ffs(LP87565_BUCK_CTRL_2_ILIM));
	}

	return -EINVAL;
}

static int lp87565_buck_get_current_limit(struct regulator_dev *rdev)
{
	int id = rdev_get_id(rdev);
	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
	int ret;
	unsigned int val;

	ret = regmap_read(lp87565->regmap, regulators[id].ctrl2_reg, &val);
	if (ret)
		return ret;

	val = (val & LP87565_BUCK_CTRL_2_ILIM) >>
	       __ffs(LP87565_BUCK_CTRL_2_ILIM);

	return (val < ARRAY_SIZE(lp87565_buck_uA)) ?
			lp87565_buck_uA[val] : -EINVAL;
}

/* Operations permitted on BUCK0, BUCK1 */
static struct regulator_ops lp87565_buck_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear_range,
	.map_voltage		= regulator_map_voltage_linear_range,
	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
	.set_ramp_delay		= lp87565_buck_set_ramp_delay,
	.set_current_limit	= lp87565_buck_set_current_limit,
	.get_current_limit	= lp87565_buck_get_current_limit,
};

static const struct lp87565_regulator regulators[] = {
	LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK0_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN, 3230,
			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
	LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
			  256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK1_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN, 3230,
			  buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
	LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK2_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN, 3230,
			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
	LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
			  256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK3_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN, 3230,
			  buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
	LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK0_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN |
			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
	LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
			  LP87565_REG_BUCK2_CTRL_1,
			  LP87565_BUCK_CTRL_1_EN, 3230,
			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
};

static int lp87565_regulator_probe(struct platform_device *pdev)
{
	struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	int i, min_idx = LP87565_BUCK_1, max_idx = LP87565_BUCK_3;

	platform_set_drvdata(pdev, lp87565);

	config.dev = &pdev->dev;
	config.dev->of_node = lp87565->dev->of_node;
	config.driver_data = lp87565;
	config.regmap = lp87565->regmap;

	if (lp87565->dev_type == LP87565_DEVICE_TYPE_LP87565_Q1) {
		min_idx = LP87565_BUCK_10;
		max_idx = LP87565_BUCK_23;
	}

	for (i = min_idx; i <= max_idx; i++) {
		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
					       &config);
		if (IS_ERR(rdev)) {
			dev_err(lp87565->dev, "failed to register %s regulator\n",
				pdev->name);
			return PTR_ERR(rdev);
		}
	}

	return 0;
}

static const struct platform_device_id lp87565_regulator_id_table[] = {
	{ "lp87565-regulator", },
	{ "lp87565-q1-regulator", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);

static struct platform_driver lp87565_regulator_driver = {
	.driver = {
		.name = "lp87565-pmic",
	},
	.probe = lp87565_regulator_probe,
	.id_table = lp87565_regulator_id_table,
};
module_platform_driver(lp87565_regulator_driver);

MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("LP87565 voltage regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f0168a9b K	1	/*
	2	* Regulator driver for LP87565 PMIC
	3	*
	4	* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
	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
580331d0	8	* Free Software Foundation version 2.
f0168a9b K	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/regmap.h>
	14
	15	#include <linux/mfd/lp87565.h>
	16
	17	#define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
	18	_delay, _lr, _cr) \
	19	[_id] = { \
	20	.desc = { \
	21	.name = _name, \
	22	.supply_name = _of "-in", \
	23	.id = _id, \
	24	.of_match = of_match_ptr(_of), \
	25	.regulators_node = of_match_ptr("regulators"),\
	26	.ops = &_ops, \
	27	.n_voltages = _n, \
	28	.type = REGULATOR_VOLTAGE, \
	29	.owner = THIS_MODULE, \
	30	.vsel_reg = _vr, \
	31	.vsel_mask = _vm, \
	32	.enable_reg = _er, \
	33	.enable_mask = _em, \
	34	.ramp_delay = _delay, \
	35	.linear_ranges = _lr, \
	36	.n_linear_ranges = ARRAY_SIZE(_lr), \
	37	}, \
	38	.ctrl2_reg = _cr, \
	39	}
	40
	41	struct lp87565_regulator {
	42	struct regulator_desc desc;
	43	unsigned int ctrl2_reg;
	44	};
	45
	46	static const struct lp87565_regulator regulators[];
	47
	48	static const struct regulator_linear_range buck0_1_2_3_ranges[] = {
42f1ea48	49	REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
f0168a9b K	50	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
	51	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
	52	};
	53
	54	static unsigned int lp87565_buck_ramp_delay[] = {
	55	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
	56	};
	57
	58	/* LP87565 BUCK current limit */
	59	static const unsigned int lp87565_buck_uA[] = {
	60	1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
	61	};
	62
	63	static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
	64	int ramp_delay)
	65	{
	66	int id = rdev_get_id(rdev);
	67	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
	68	unsigned int reg;
	69	int ret;
	70
	71	if (ramp_delay <= 470)
	72	reg = 7;
	73	else if (ramp_delay <= 940)
	74	reg = 6;
	75	else if (ramp_delay <= 1900)
	76	reg = 5;
	77	else if (ramp_delay <= 3800)
	78	reg = 4;
	79	else if (ramp_delay <= 7500)
	80	reg = 3;
	81	else if (ramp_delay <= 10000)
	82	reg = 2;
	83	else if (ramp_delay <= 15000)
	84	reg = 1;
	85	else
	86	reg = 0;
	87
	88	ret = regmap_update_bits(lp87565->regmap, regulators[id].ctrl2_reg,
	89	LP87565_BUCK_CTRL_2_SLEW_RATE,
	90	reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
	91	if (ret) {
	92	dev_err(lp87565->dev, "SLEW RATE write failed: %d\n", ret);
	93	return ret;
	94	}
	95
	96	rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
	97
2d045e94 K	98	/* Conservatively give a 15% margin */
	99	rdev->constraints->ramp_delay =
	100	rdev->constraints->ramp_delay * 85 / 100;
	101
f0168a9b K	102	return 0;
	103	}
	104
	105	static int lp87565_buck_set_current_limit(struct regulator_dev *rdev,
	106	int min_uA, int max_uA)
	107	{
	108	int id = rdev_get_id(rdev);
	109	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
	110	int i;
	111
	112	for (i = ARRAY_SIZE(lp87565_buck_uA) - 1; i >= 0; i--) {
	113	if (lp87565_buck_uA[i] >= min_uA &&
	114	lp87565_buck_uA[i] <= max_uA)
	115	return regmap_update_bits(lp87565->regmap,
	116	regulators[id].ctrl2_reg,
	117	LP87565_BUCK_CTRL_2_ILIM,
	118	i << __ffs(LP87565_BUCK_CTRL_2_ILIM));
	119	}
	120
	121	return -EINVAL;
	122	}
	123
	124	static int lp87565_buck_get_current_limit(struct regulator_dev *rdev)
	125	{
	126	int id = rdev_get_id(rdev);
	127	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
	128	int ret;
	129	unsigned int val;
	130
	131	ret = regmap_read(lp87565->regmap, regulators[id].ctrl2_reg, &val);
	132	if (ret)
	133	return ret;
	134
	135	val = (val & LP87565_BUCK_CTRL_2_ILIM) >>
	136	__ffs(LP87565_BUCK_CTRL_2_ILIM);
	137
	138	return (val < ARRAY_SIZE(lp87565_buck_uA)) ?
	139	lp87565_buck_uA[val] : -EINVAL;
	140	}
	141
	142	/* Operations permitted on BUCK0, BUCK1 */
	143	static struct regulator_ops lp87565_buck_ops = {
	144	.is_enabled = regulator_is_enabled_regmap,
	145	.enable = regulator_enable_regmap,
	146	.disable = regulator_disable_regmap,
	147	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	148	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	149	.list_voltage = regulator_list_voltage_linear_range,
	150	.map_voltage = regulator_map_voltage_linear_range,
	151	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	152	.set_ramp_delay = lp87565_buck_set_ramp_delay,
	153	.set_current_limit = lp87565_buck_set_current_limit,
	154	.get_current_limit = lp87565_buck_get_current_limit,
	155	};
	156
	157	static const struct lp87565_regulator regulators[] = {
	158	LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
	159	256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
	160	LP87565_REG_BUCK0_CTRL_1,
2d045e94	161	LP87565_BUCK_CTRL_1_EN, 3230,
f0168a9b K	162	buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
	163	LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
	164	256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
	165	LP87565_REG_BUCK1_CTRL_1,
2d045e94	166	LP87565_BUCK_CTRL_1_EN, 3230,
f0168a9b K	167	buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
	168	LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
	169	256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
	170	LP87565_REG_BUCK2_CTRL_1,
2d045e94	171	LP87565_BUCK_CTRL_1_EN, 3230,
f0168a9b K	172	buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
	173	LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
	174	256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
	175	LP87565_REG_BUCK3_CTRL_1,
2d045e94	176	LP87565_BUCK_CTRL_1_EN, 3230,
f0168a9b K	177	buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
	178	LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
	179	256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
	180	LP87565_REG_BUCK0_CTRL_1,
2f51a260 K	181	LP87565_BUCK_CTRL_1_EN \|
2f51a260 K	182	LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
f0168a9b K	183	buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
	184	LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
	185	256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
	186	LP87565_REG_BUCK2_CTRL_1,
2d045e94	187	LP87565_BUCK_CTRL_1_EN, 3230,
f0168a9b K	188	buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
	189	};
	190
	191	static int lp87565_regulator_probe(struct platform_device *pdev)
	192	{
	193	struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
	194	struct regulator_config config = { };
	195	struct regulator_dev *rdev;
	196	int i, min_idx = LP87565_BUCK_1, max_idx = LP87565_BUCK_3;
	197
	198	platform_set_drvdata(pdev, lp87565);
	199
	200	config.dev = &pdev->dev;
	201	config.dev->of_node = lp87565->dev->of_node;
	202	config.driver_data = lp87565;
	203	config.regmap = lp87565->regmap;
	204
	205	if (lp87565->dev_type == LP87565_DEVICE_TYPE_LP87565_Q1) {
	206	min_idx = LP87565_BUCK_10;
	207	max_idx = LP87565_BUCK_23;
	208	}
	209
	210	for (i = min_idx; i <= max_idx; i++) {
	211	rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
	212	&config);
	213	if (IS_ERR(rdev)) {
	214	dev_err(lp87565->dev, "failed to register %s regulator\n",
	215	pdev->name);
	216	return PTR_ERR(rdev);
	217	}
	218	}
	219
	220	return 0;
	221	}
	222
	223	static const struct platform_device_id lp87565_regulator_id_table[] = {
	224	{ "lp87565-regulator", },
	225	{ "lp87565-q1-regulator", },
	226	{ /* sentinel */ }
	227	};
	228	MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
	229
	230	static struct platform_driver lp87565_regulator_driver = {
	231	.driver = {
	232	.name = "lp87565-pmic",
	233	},
	234	.probe = lp87565_regulator_probe,
	235	.id_table = lp87565_regulator_id_table,
	236	};
	237	module_platform_driver(lp87565_regulator_driver);
	238
	239	MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
	240	MODULE_DESCRIPTION("LP87565 voltage regulator driver");
	241	MODULE_LICENSE("GPL v2");