1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * tps65218-regulator.c
4  *
5  * Regulator driver for TPS65218 PMIC
6  *
7  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/device.h>
13 #include <linux/init.h>
14 #include <linux/err.h>
15 #include <linux/platform_device.h>
16 #include <linux/of_device.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/of_regulator.h>
19 #include <linux/regulator/driver.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/mfd/tps65218.h>
22 
23 #define TPS65218_REGULATOR(_name, _of, _id, _type, _ops, _n, _vr, _vm, _er, \
24 			   _em, _cr, _cm, _lr, _nlr, _delay, _fuv, _sr, _sm, \
25 			   _ct, _ncl) \
26 	{							\
27 		.name			= _name,		\
28 		.of_match		= _of,			\
29 		.id			= _id,			\
30 		.ops			= &_ops,		\
31 		.n_voltages		= _n,			\
32 		.type			= _type,	\
33 		.owner			= THIS_MODULE,		\
34 		.vsel_reg		= _vr,			\
35 		.vsel_mask		= _vm,			\
36 		.csel_reg		= _cr,			\
37 		.csel_mask		= _cm,			\
38 		.curr_table		= _ct,			\
39 		.n_current_limits	= _ncl,			\
40 		.enable_reg		= _er,			\
41 		.enable_mask		= _em,			\
42 		.volt_table		= NULL,			\
43 		.linear_ranges		= _lr,			\
44 		.n_linear_ranges	= _nlr,			\
45 		.ramp_delay		= _delay,		\
46 		.fixed_uV		= _fuv,			\
47 		.bypass_reg	= _sr,				\
48 		.bypass_mask	= _sm,				\
49 	}							\
50 
51 static const struct linear_range dcdc1_dcdc2_ranges[] = {
52 	REGULATOR_LINEAR_RANGE(850000, 0x0, 0x32, 10000),
53 	REGULATOR_LINEAR_RANGE(1375000, 0x33, 0x3f, 25000),
54 };
55 
56 static const struct linear_range ldo1_dcdc3_ranges[] = {
57 	REGULATOR_LINEAR_RANGE(900000, 0x0, 0x1a, 25000),
58 	REGULATOR_LINEAR_RANGE(1600000, 0x1b, 0x3f, 50000),
59 };
60 
61 static const struct linear_range dcdc4_ranges[] = {
62 	REGULATOR_LINEAR_RANGE(1175000, 0x0, 0xf, 25000),
63 	REGULATOR_LINEAR_RANGE(1600000, 0x10, 0x34, 50000),
64 };
65 
66 static int tps65218_pmic_set_voltage_sel(struct regulator_dev *dev,
67 					 unsigned selector)
68 {
69 	int ret;
70 	struct tps65218 *tps = rdev_get_drvdata(dev);
71 	unsigned int rid = rdev_get_id(dev);
72 
73 	/* Set the voltage based on vsel value and write protect level is 2 */
74 	ret = tps65218_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
75 				selector, TPS65218_PROTECT_L1);
76 
77 	/* Set GO bit for DCDC1/2 to initiate voltage transistion */
78 	switch (rid) {
79 	case TPS65218_DCDC_1:
80 	case TPS65218_DCDC_2:
81 		ret = tps65218_set_bits(tps, TPS65218_REG_CONTRL_SLEW_RATE,
82 					TPS65218_SLEW_RATE_GO,
83 					TPS65218_SLEW_RATE_GO,
84 					TPS65218_PROTECT_L1);
85 		break;
86 	}
87 
88 	return ret;
89 }
90 
91 static int tps65218_pmic_enable(struct regulator_dev *dev)
92 {
93 	struct tps65218 *tps = rdev_get_drvdata(dev);
94 	int rid = rdev_get_id(dev);
95 
96 	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
97 		return -EINVAL;
98 
99 	/* Enable the regulator and password protection is level 1 */
100 	return tps65218_set_bits(tps, dev->desc->enable_reg,
101 				 dev->desc->enable_mask, dev->desc->enable_mask,
102 				 TPS65218_PROTECT_L1);
103 }
104 
105 static int tps65218_pmic_disable(struct regulator_dev *dev)
106 {
107 	struct tps65218 *tps = rdev_get_drvdata(dev);
108 	int rid = rdev_get_id(dev);
109 
110 	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
111 		return -EINVAL;
112 
113 	/* Disable the regulator and password protection is level 1 */
114 	return tps65218_clear_bits(tps, dev->desc->enable_reg,
115 				   dev->desc->enable_mask, TPS65218_PROTECT_L1);
116 }
117 
118 static int tps65218_pmic_set_suspend_enable(struct regulator_dev *dev)
119 {
120 	struct tps65218 *tps = rdev_get_drvdata(dev);
121 	unsigned int rid = rdev_get_id(dev);
122 
123 	if (rid > TPS65218_LDO_1)
124 		return -EINVAL;
125 
126 	return tps65218_clear_bits(tps, dev->desc->bypass_reg,
127 				   dev->desc->bypass_mask,
128 				   TPS65218_PROTECT_L1);
129 }
130 
131 static int tps65218_pmic_set_suspend_disable(struct regulator_dev *dev)
132 {
133 	struct tps65218 *tps = rdev_get_drvdata(dev);
134 	unsigned int rid = rdev_get_id(dev);
135 
136 	if (rid > TPS65218_LDO_1)
137 		return -EINVAL;
138 
139 	/*
140 	 * Certain revisions of TPS65218 will need to have DCDC3 regulator
141 	 * enabled always, otherwise an immediate system reboot will occur
142 	 * during poweroff.
143 	 */
144 	if (rid == TPS65218_DCDC_3 && tps->rev == TPS65218_REV_2_1)
145 		return 0;
146 
147 	if (!tps->strobes[rid]) {
148 		if (rid == TPS65218_DCDC_3)
149 			tps->strobes[rid] = 3;
150 		else
151 			return -EINVAL;
152 	}
153 
154 	return tps65218_set_bits(tps, dev->desc->bypass_reg,
155 				 dev->desc->bypass_mask,
156 				 tps->strobes[rid], TPS65218_PROTECT_L1);
157 }
158 
159 /* Operations permitted on DCDC1, DCDC2 */
160 static const struct regulator_ops tps65218_dcdc12_ops = {
161 	.is_enabled		= regulator_is_enabled_regmap,
162 	.enable			= tps65218_pmic_enable,
163 	.disable		= tps65218_pmic_disable,
164 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
165 	.set_voltage_sel	= tps65218_pmic_set_voltage_sel,
166 	.list_voltage		= regulator_list_voltage_linear_range,
167 	.map_voltage		= regulator_map_voltage_linear_range,
168 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
169 	.set_suspend_enable	= tps65218_pmic_set_suspend_enable,
170 	.set_suspend_disable	= tps65218_pmic_set_suspend_disable,
171 };
172 
173 /* Operations permitted on DCDC3, DCDC4 and LDO1 */
174 static const struct regulator_ops tps65218_ldo1_dcdc34_ops = {
175 	.is_enabled		= regulator_is_enabled_regmap,
176 	.enable			= tps65218_pmic_enable,
177 	.disable		= tps65218_pmic_disable,
178 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
179 	.set_voltage_sel	= tps65218_pmic_set_voltage_sel,
180 	.list_voltage		= regulator_list_voltage_linear_range,
181 	.map_voltage		= regulator_map_voltage_linear_range,
182 	.set_suspend_enable	= tps65218_pmic_set_suspend_enable,
183 	.set_suspend_disable	= tps65218_pmic_set_suspend_disable,
184 };
185 
186 static const unsigned int ls3_currents[] = { 100000, 200000, 500000, 1000000 };
187 
188 static int tps65218_pmic_set_input_current_lim(struct regulator_dev *dev,
189 					       int lim_uA)
190 {
191 	unsigned int index = 0;
192 	unsigned int num_currents = ARRAY_SIZE(ls3_currents);
193 	struct tps65218 *tps = rdev_get_drvdata(dev);
194 
195 	while (index < num_currents && ls3_currents[index] != lim_uA)
196 		index++;
197 
198 	if (index == num_currents)
199 		return -EINVAL;
200 
201 	return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
202 				 index << __builtin_ctz(dev->desc->csel_mask),
203 				 TPS65218_PROTECT_L1);
204 }
205 
206 static int tps65218_pmic_set_current_limit(struct regulator_dev *dev,
207 					   int min_uA, int max_uA)
208 {
209 	int index = 0;
210 	unsigned int num_currents = ARRAY_SIZE(ls3_currents);
211 	struct tps65218 *tps = rdev_get_drvdata(dev);
212 
213 	while (index < num_currents && ls3_currents[index] <= max_uA)
214 		index++;
215 
216 	index--;
217 
218 	if (index < 0 || ls3_currents[index] < min_uA)
219 		return -EINVAL;
220 
221 	return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
222 				 index << __builtin_ctz(dev->desc->csel_mask),
223 				 TPS65218_PROTECT_L1);
224 }
225 
226 static const struct regulator_ops tps65218_ls23_ops = {
227 	.is_enabled		= regulator_is_enabled_regmap,
228 	.enable			= tps65218_pmic_enable,
229 	.disable		= tps65218_pmic_disable,
230 	.set_input_current_limit = tps65218_pmic_set_input_current_lim,
231 	.set_current_limit	= tps65218_pmic_set_current_limit,
232 	.get_current_limit	= regulator_get_current_limit_regmap,
233 };
234 
235 /* Operations permitted on DCDC5, DCDC6 */
236 static const struct regulator_ops tps65218_dcdc56_pmic_ops = {
237 	.is_enabled		= regulator_is_enabled_regmap,
238 	.enable			= tps65218_pmic_enable,
239 	.disable		= tps65218_pmic_disable,
240 	.set_suspend_enable	= tps65218_pmic_set_suspend_enable,
241 	.set_suspend_disable	= tps65218_pmic_set_suspend_disable,
242 };
243 
244 static const struct regulator_desc regulators[] = {
245 	TPS65218_REGULATOR("DCDC1", "regulator-dcdc1", TPS65218_DCDC_1,
246 			   REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
247 			   TPS65218_REG_CONTROL_DCDC1,
248 			   TPS65218_CONTROL_DCDC1_MASK, TPS65218_REG_ENABLE1,
249 			   TPS65218_ENABLE1_DC1_EN, 0, 0, dcdc1_dcdc2_ranges,
250 			   2, 4000, 0, TPS65218_REG_SEQ3,
251 			   TPS65218_SEQ3_DC1_SEQ_MASK, NULL, 0),
252 	TPS65218_REGULATOR("DCDC2", "regulator-dcdc2", TPS65218_DCDC_2,
253 			   REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
254 			   TPS65218_REG_CONTROL_DCDC2,
255 			   TPS65218_CONTROL_DCDC2_MASK, TPS65218_REG_ENABLE1,
256 			   TPS65218_ENABLE1_DC2_EN, 0, 0, dcdc1_dcdc2_ranges,
257 			   2, 4000, 0, TPS65218_REG_SEQ3,
258 			   TPS65218_SEQ3_DC2_SEQ_MASK, NULL, 0),
259 	TPS65218_REGULATOR("DCDC3", "regulator-dcdc3", TPS65218_DCDC_3,
260 			   REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
261 			   TPS65218_REG_CONTROL_DCDC3,
262 			   TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
263 			   TPS65218_ENABLE1_DC3_EN, 0, 0, ldo1_dcdc3_ranges, 2,
264 			   0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC3_SEQ_MASK,
265 			   NULL, 0),
266 	TPS65218_REGULATOR("DCDC4", "regulator-dcdc4", TPS65218_DCDC_4,
267 			   REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 53,
268 			   TPS65218_REG_CONTROL_DCDC4,
269 			   TPS65218_CONTROL_DCDC4_MASK, TPS65218_REG_ENABLE1,
270 			   TPS65218_ENABLE1_DC4_EN, 0, 0, dcdc4_ranges, 2,
271 			   0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC4_SEQ_MASK,
272 			   NULL, 0),
273 	TPS65218_REGULATOR("DCDC5", "regulator-dcdc5", TPS65218_DCDC_5,
274 			   REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
275 			   -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC5_EN, 0,
276 			   0, NULL, 0, 0, 1000000, TPS65218_REG_SEQ5,
277 			   TPS65218_SEQ5_DC5_SEQ_MASK, NULL, 0),
278 	TPS65218_REGULATOR("DCDC6", "regulator-dcdc6", TPS65218_DCDC_6,
279 			   REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
280 			   -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC6_EN, 0,
281 			   0, NULL, 0, 0, 1800000, TPS65218_REG_SEQ5,
282 			   TPS65218_SEQ5_DC6_SEQ_MASK, NULL, 0),
283 	TPS65218_REGULATOR("LDO1", "regulator-ldo1", TPS65218_LDO_1,
284 			   REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
285 			   TPS65218_REG_CONTROL_LDO1,
286 			   TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
287 			   TPS65218_ENABLE2_LDO1_EN, 0, 0, ldo1_dcdc3_ranges,
288 			   2, 0, 0, TPS65218_REG_SEQ6,
289 			   TPS65218_SEQ6_LDO1_SEQ_MASK, NULL, 0),
290 	TPS65218_REGULATOR("LS2", "regulator-ls2", TPS65218_LS_2,
291 			   REGULATOR_CURRENT, tps65218_ls23_ops, 0, 0, 0,
292 			   TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS2_EN,
293 			   TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS2ILIM_MASK,
294 			   NULL, 0, 0, 0, 0, 0, ls3_currents,
295 			   ARRAY_SIZE(ls3_currents)),
296 	TPS65218_REGULATOR("LS3", "regulator-ls3", TPS65218_LS_3,
297 			   REGULATOR_CURRENT, tps65218_ls23_ops, 0, 0, 0,
298 			   TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS3_EN,
299 			   TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS3ILIM_MASK,
300 			   NULL, 0, 0, 0, 0, 0, ls3_currents,
301 			   ARRAY_SIZE(ls3_currents)),
302 };
303 
304 static int tps65218_regulator_probe(struct platform_device *pdev)
305 {
306 	struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
307 	struct regulator_dev *rdev;
308 	struct regulator_config config = { };
309 	int i, ret;
310 	unsigned int val;
311 
312 	config.dev = &pdev->dev;
313 	config.dev->of_node = tps->dev->of_node;
314 	config.driver_data = tps;
315 	config.regmap = tps->regmap;
316 
317 	/* Allocate memory for strobes */
318 	tps->strobes = devm_kcalloc(&pdev->dev,
319 				    TPS65218_NUM_REGULATOR, sizeof(u8),
320 				    GFP_KERNEL);
321 	if (!tps->strobes)
322 		return -ENOMEM;
323 
324 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
325 		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
326 					       &config);
327 		if (IS_ERR(rdev)) {
328 			dev_err(tps->dev, "failed to register %s regulator\n",
329 				pdev->name);
330 			return PTR_ERR(rdev);
331 		}
332 
333 		ret = regmap_read(tps->regmap, regulators[i].bypass_reg, &val);
334 		if (ret)
335 			return ret;
336 
337 		tps->strobes[i] = val & regulators[i].bypass_mask;
338 	}
339 
340 	return 0;
341 }
342 
343 static const struct platform_device_id tps65218_regulator_id_table[] = {
344 	{ "tps65218-regulator", },
345 	{ /* sentinel */ }
346 };
347 MODULE_DEVICE_TABLE(platform, tps65218_regulator_id_table);
348 
349 static struct platform_driver tps65218_regulator_driver = {
350 	.driver = {
351 		.name = "tps65218-pmic",
352 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
353 	},
354 	.probe = tps65218_regulator_probe,
355 	.id_table = tps65218_regulator_id_table,
356 };
357 
358 module_platform_driver(tps65218_regulator_driver);
359 
360 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
361 MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
362 MODULE_ALIAS("platform:tps65218-pmic");
363 MODULE_LICENSE("GPL v2");
364