1 /*
2  * tps65218-regulator.c
3  *
4  * Regulator driver for TPS65218 PMIC
5  *
6  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13  * kind, whether expressed or implied; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License version 2 for more details.
16  */
17 
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/init.h>
22 #include <linux/err.h>
23 #include <linux/platform_device.h>
24 #include <linux/of_device.h>
25 #include <linux/regmap.h>
26 #include <linux/regulator/of_regulator.h>
27 #include <linux/regulator/driver.h>
28 #include <linux/regulator/machine.h>
29 #include <linux/mfd/tps65218.h>
30 
31 #define TPS65218_REGULATOR(_name, _of, _id, _type, _ops, _n, _vr, _vm, _er, \
32 			   _em, _cr, _cm, _lr, _nlr, _delay, _fuv, _sr, _sm, \
33 			   _ct, _ncl) \
34 	{							\
35 		.name			= _name,		\
36 		.of_match		= _of,			\
37 		.id			= _id,			\
38 		.ops			= &_ops,		\
39 		.n_voltages		= _n,			\
40 		.type			= _type,	\
41 		.owner			= THIS_MODULE,		\
42 		.vsel_reg		= _vr,			\
43 		.vsel_mask		= _vm,			\
44 		.csel_reg		= _cr,			\
45 		.csel_mask		= _cm,			\
46 		.curr_table		= _ct,			\
47 		.n_current_limits	= _ncl,			\
48 		.enable_reg		= _er,			\
49 		.enable_mask		= _em,			\
50 		.volt_table		= NULL,			\
51 		.linear_ranges		= _lr,			\
52 		.n_linear_ranges	= _nlr,			\
53 		.ramp_delay		= _delay,		\
54 		.fixed_uV		= _fuv,			\
55 		.bypass_reg	= _sr,				\
56 		.bypass_mask	= _sm,				\
57 	}							\
58 
59 static const struct regulator_linear_range dcdc1_dcdc2_ranges[] = {
60 	REGULATOR_LINEAR_RANGE(850000, 0x0, 0x32, 10000),
61 	REGULATOR_LINEAR_RANGE(1375000, 0x33, 0x3f, 25000),
62 };
63 
64 static const struct regulator_linear_range ldo1_dcdc3_ranges[] = {
65 	REGULATOR_LINEAR_RANGE(900000, 0x0, 0x1a, 25000),
66 	REGULATOR_LINEAR_RANGE(1600000, 0x1b, 0x3f, 50000),
67 };
68 
69 static const struct regulator_linear_range dcdc4_ranges[] = {
70 	REGULATOR_LINEAR_RANGE(1175000, 0x0, 0xf, 25000),
71 	REGULATOR_LINEAR_RANGE(1600000, 0x10, 0x34, 50000),
72 };
73 
74 static int tps65218_pmic_set_voltage_sel(struct regulator_dev *dev,
75 					 unsigned selector)
76 {
77 	int ret;
78 	struct tps65218 *tps = rdev_get_drvdata(dev);
79 	unsigned int rid = rdev_get_id(dev);
80 
81 	/* Set the voltage based on vsel value and write protect level is 2 */
82 	ret = tps65218_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
83 				selector, TPS65218_PROTECT_L1);
84 
85 	/* Set GO bit for DCDC1/2 to initiate voltage transistion */
86 	switch (rid) {
87 	case TPS65218_DCDC_1:
88 	case TPS65218_DCDC_2:
89 		ret = tps65218_set_bits(tps, TPS65218_REG_CONTRL_SLEW_RATE,
90 					TPS65218_SLEW_RATE_GO,
91 					TPS65218_SLEW_RATE_GO,
92 					TPS65218_PROTECT_L1);
93 		break;
94 	}
95 
96 	return ret;
97 }
98 
99 static int tps65218_pmic_enable(struct regulator_dev *dev)
100 {
101 	struct tps65218 *tps = rdev_get_drvdata(dev);
102 	int rid = rdev_get_id(dev);
103 
104 	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
105 		return -EINVAL;
106 
107 	/* Enable the regulator and password protection is level 1 */
108 	return tps65218_set_bits(tps, dev->desc->enable_reg,
109 				 dev->desc->enable_mask, dev->desc->enable_mask,
110 				 TPS65218_PROTECT_L1);
111 }
112 
113 static int tps65218_pmic_disable(struct regulator_dev *dev)
114 {
115 	struct tps65218 *tps = rdev_get_drvdata(dev);
116 	int rid = rdev_get_id(dev);
117 
118 	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
119 		return -EINVAL;
120 
121 	/* Disable the regulator and password protection is level 1 */
122 	return tps65218_clear_bits(tps, dev->desc->enable_reg,
123 				   dev->desc->enable_mask, TPS65218_PROTECT_L1);
124 }
125 
126 static int tps65218_pmic_set_suspend_enable(struct regulator_dev *dev)
127 {
128 	struct tps65218 *tps = rdev_get_drvdata(dev);
129 	unsigned int rid = rdev_get_id(dev);
130 
131 	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
132 		return -EINVAL;
133 
134 	return tps65218_clear_bits(tps, dev->desc->bypass_reg,
135 				   dev->desc->bypass_mask,
136 				   TPS65218_PROTECT_L1);
137 }
138 
139 static int tps65218_pmic_set_suspend_disable(struct regulator_dev *dev)
140 {
141 	struct tps65218 *tps = rdev_get_drvdata(dev);
142 	unsigned int rid = rdev_get_id(dev);
143 
144 	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
145 		return -EINVAL;
146 
147 	/*
148 	 * Certain revisions of TPS65218 will need to have DCDC3 regulator
149 	 * enabled always, otherwise an immediate system reboot will occur
150 	 * during poweroff.
151 	 */
152 	if (rid == TPS65218_DCDC_3 && tps->rev == TPS65218_REV_2_1)
153 		return 0;
154 
155 	if (!tps->strobes[rid]) {
156 		if (rid == TPS65218_DCDC_3)
157 			tps->strobes[rid] = 3;
158 		else
159 			return -EINVAL;
160 	}
161 
162 	return tps65218_set_bits(tps, dev->desc->bypass_reg,
163 				 dev->desc->bypass_mask,
164 				 tps->strobes[rid], TPS65218_PROTECT_L1);
165 }
166 
167 /* Operations permitted on DCDC1, DCDC2 */
168 static const struct regulator_ops tps65218_dcdc12_ops = {
169 	.is_enabled		= regulator_is_enabled_regmap,
170 	.enable			= tps65218_pmic_enable,
171 	.disable		= tps65218_pmic_disable,
172 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
173 	.set_voltage_sel	= tps65218_pmic_set_voltage_sel,
174 	.list_voltage		= regulator_list_voltage_linear_range,
175 	.map_voltage		= regulator_map_voltage_linear_range,
176 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
177 	.set_suspend_enable	= tps65218_pmic_set_suspend_enable,
178 	.set_suspend_disable	= tps65218_pmic_set_suspend_disable,
179 };
180 
181 /* Operations permitted on DCDC3, DCDC4 and LDO1 */
182 static const struct regulator_ops tps65218_ldo1_dcdc34_ops = {
183 	.is_enabled		= regulator_is_enabled_regmap,
184 	.enable			= tps65218_pmic_enable,
185 	.disable		= tps65218_pmic_disable,
186 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
187 	.set_voltage_sel	= tps65218_pmic_set_voltage_sel,
188 	.list_voltage		= regulator_list_voltage_linear_range,
189 	.map_voltage		= regulator_map_voltage_linear_range,
190 	.set_suspend_enable	= tps65218_pmic_set_suspend_enable,
191 	.set_suspend_disable	= tps65218_pmic_set_suspend_disable,
192 };
193 
194 static const unsigned int ls3_currents[] = { 100000, 200000, 500000, 1000000 };
195 
196 static int tps65218_pmic_set_input_current_lim(struct regulator_dev *dev,
197 					       int lim_uA)
198 {
199 	unsigned int index = 0;
200 	unsigned int num_currents = ARRAY_SIZE(ls3_currents);
201 	struct tps65218 *tps = rdev_get_drvdata(dev);
202 
203 	while (index < num_currents && ls3_currents[index] != lim_uA)
204 		index++;
205 
206 	if (index == num_currents)
207 		return -EINVAL;
208 
209 	return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
210 				 index << __builtin_ctz(dev->desc->csel_mask),
211 				 TPS65218_PROTECT_L1);
212 }
213 
214 static int tps65218_pmic_set_current_limit(struct regulator_dev *dev,
215 					   int min_uA, int max_uA)
216 {
217 	int index = 0;
218 	unsigned int num_currents = ARRAY_SIZE(ls3_currents);
219 	struct tps65218 *tps = rdev_get_drvdata(dev);
220 
221 	while (index < num_currents && ls3_currents[index] <= max_uA)
222 		index++;
223 
224 	index--;
225 
226 	if (index < 0 || ls3_currents[index] < min_uA)
227 		return -EINVAL;
228 
229 	return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
230 				 index << __builtin_ctz(dev->desc->csel_mask),
231 				 TPS65218_PROTECT_L1);
232 }
233 
234 static const struct regulator_ops tps65218_ls23_ops = {
235 	.is_enabled		= regulator_is_enabled_regmap,
236 	.enable			= tps65218_pmic_enable,
237 	.disable		= tps65218_pmic_disable,
238 	.set_input_current_limit = tps65218_pmic_set_input_current_lim,
239 	.set_current_limit	= tps65218_pmic_set_current_limit,
240 	.get_current_limit	= regulator_get_current_limit_regmap,
241 };
242 
243 /* Operations permitted on DCDC5, DCDC6 */
244 static const struct regulator_ops tps65218_dcdc56_pmic_ops = {
245 	.is_enabled		= regulator_is_enabled_regmap,
246 	.enable			= tps65218_pmic_enable,
247 	.disable		= tps65218_pmic_disable,
248 	.set_suspend_enable	= tps65218_pmic_set_suspend_enable,
249 	.set_suspend_disable	= tps65218_pmic_set_suspend_disable,
250 };
251 
252 static const struct regulator_desc regulators[] = {
253 	TPS65218_REGULATOR("DCDC1", "regulator-dcdc1", TPS65218_DCDC_1,
254 			   REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
255 			   TPS65218_REG_CONTROL_DCDC1,
256 			   TPS65218_CONTROL_DCDC1_MASK, TPS65218_REG_ENABLE1,
257 			   TPS65218_ENABLE1_DC1_EN, 0, 0, dcdc1_dcdc2_ranges,
258 			   2, 4000, 0, TPS65218_REG_SEQ3,
259 			   TPS65218_SEQ3_DC1_SEQ_MASK, NULL, 0),
260 	TPS65218_REGULATOR("DCDC2", "regulator-dcdc2", TPS65218_DCDC_2,
261 			   REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
262 			   TPS65218_REG_CONTROL_DCDC2,
263 			   TPS65218_CONTROL_DCDC2_MASK, TPS65218_REG_ENABLE1,
264 			   TPS65218_ENABLE1_DC2_EN, 0, 0, dcdc1_dcdc2_ranges,
265 			   2, 4000, 0, TPS65218_REG_SEQ3,
266 			   TPS65218_SEQ3_DC2_SEQ_MASK, NULL, 0),
267 	TPS65218_REGULATOR("DCDC3", "regulator-dcdc3", TPS65218_DCDC_3,
268 			   REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
269 			   TPS65218_REG_CONTROL_DCDC3,
270 			   TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
271 			   TPS65218_ENABLE1_DC3_EN, 0, 0, ldo1_dcdc3_ranges, 2,
272 			   0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC3_SEQ_MASK,
273 			   NULL, 0),
274 	TPS65218_REGULATOR("DCDC4", "regulator-dcdc4", TPS65218_DCDC_4,
275 			   REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 53,
276 			   TPS65218_REG_CONTROL_DCDC4,
277 			   TPS65218_CONTROL_DCDC4_MASK, TPS65218_REG_ENABLE1,
278 			   TPS65218_ENABLE1_DC4_EN, 0, 0, dcdc4_ranges, 2,
279 			   0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC4_SEQ_MASK,
280 			   NULL, 0),
281 	TPS65218_REGULATOR("DCDC5", "regulator-dcdc5", TPS65218_DCDC_5,
282 			   REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
283 			   -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC5_EN, 0,
284 			   0, NULL, 0, 0, 1000000, TPS65218_REG_SEQ5,
285 			   TPS65218_SEQ5_DC5_SEQ_MASK, NULL, 0),
286 	TPS65218_REGULATOR("DCDC6", "regulator-dcdc6", TPS65218_DCDC_6,
287 			   REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
288 			   -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC6_EN, 0,
289 			   0, NULL, 0, 0, 1800000, TPS65218_REG_SEQ5,
290 			   TPS65218_SEQ5_DC6_SEQ_MASK, NULL, 0),
291 	TPS65218_REGULATOR("LDO1", "regulator-ldo1", TPS65218_LDO_1,
292 			   REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
293 			   TPS65218_REG_CONTROL_LDO1,
294 			   TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
295 			   TPS65218_ENABLE2_LDO1_EN, 0, 0, ldo1_dcdc3_ranges,
296 			   2, 0, 0, TPS65218_REG_SEQ6,
297 			   TPS65218_SEQ6_LDO1_SEQ_MASK, NULL, 0),
298 	TPS65218_REGULATOR("LS2", "regulator-ls2", TPS65218_LS_2,
299 			   REGULATOR_CURRENT, tps65218_ls23_ops, 0, 0, 0,
300 			   TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS2_EN,
301 			   TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS2ILIM_MASK,
302 			   NULL, 0, 0, 0, 0, 0, ls3_currents,
303 			   ARRAY_SIZE(ls3_currents)),
304 	TPS65218_REGULATOR("LS3", "regulator-ls3", TPS65218_LS_3,
305 			   REGULATOR_CURRENT, tps65218_ls23_ops, 0, 0, 0,
306 			   TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS3_EN,
307 			   TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS3ILIM_MASK,
308 			   NULL, 0, 0, 0, 0, 0, ls3_currents,
309 			   ARRAY_SIZE(ls3_currents)),
310 };
311 
312 static int tps65218_regulator_probe(struct platform_device *pdev)
313 {
314 	struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
315 	struct regulator_dev *rdev;
316 	struct regulator_config config = { };
317 	int i, ret;
318 	unsigned int val;
319 
320 	config.dev = &pdev->dev;
321 	config.dev->of_node = tps->dev->of_node;
322 	config.driver_data = tps;
323 	config.regmap = tps->regmap;
324 
325 	/* Allocate memory for strobes */
326 	tps->strobes = devm_kcalloc(&pdev->dev,
327 				    TPS65218_NUM_REGULATOR, sizeof(u8),
328 				    GFP_KERNEL);
329 	if (!tps->strobes)
330 		return -ENOMEM;
331 
332 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
333 		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
334 					       &config);
335 		if (IS_ERR(rdev)) {
336 			dev_err(tps->dev, "failed to register %s regulator\n",
337 				pdev->name);
338 			return PTR_ERR(rdev);
339 		}
340 
341 		ret = regmap_read(tps->regmap, regulators[i].bypass_reg, &val);
342 		if (ret)
343 			return ret;
344 
345 		tps->strobes[i] = val & regulators[i].bypass_mask;
346 	}
347 
348 	return 0;
349 }
350 
351 static const struct platform_device_id tps65218_regulator_id_table[] = {
352 	{ "tps65218-regulator", },
353 	{ /* sentinel */ }
354 };
355 MODULE_DEVICE_TABLE(platform, tps65218_regulator_id_table);
356 
357 static struct platform_driver tps65218_regulator_driver = {
358 	.driver = {
359 		.name = "tps65218-pmic",
360 	},
361 	.probe = tps65218_regulator_probe,
362 	.id_table = tps65218_regulator_id_table,
363 };
364 
365 module_platform_driver(tps65218_regulator_driver);
366 
367 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
368 MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
369 MODULE_ALIAS("platform:tps65218-pmic");
370 MODULE_LICENSE("GPL v2");
371