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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
31enum tps65218_regulators { DCDC1, DCDC2, DCDC3, DCDC4,
32 DCDC5, DCDC6, LDO1, LS3 };
33
34#define TPS65218_REGULATOR(_name, _of, _id, _type, _ops, _n, _vr, _vm, _er, \
35 _em, _cr, _cm, _lr, _nlr, _delay, _fuv, _sr, _sm) \
36 { \
37 .name = _name, \
38 .of_match = _of, \
39 .id = _id, \
40 .ops = &_ops, \
41 .n_voltages = _n, \
42 .type = _type, \
43 .owner = THIS_MODULE, \
44 .vsel_reg = _vr, \
45 .vsel_mask = _vm, \
46 .csel_reg = _cr, \
47 .csel_mask = _cm, \
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
59static 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
64static 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
69static 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
74static 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
99static 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
113static 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
126static 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
139static 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->info[rid]->strobe = 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 */
168static 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 */
182static 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
194static const int ls3_currents[] = { 100, 200, 500, 1000 };
195
196static 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 << 2, TPS65218_PROTECT_L1);
211}
212
213static int tps65218_pmic_set_current_limit(struct regulator_dev *dev,
214 int min_uA, int max_uA)
215{
216 int index = 0;
217 unsigned int num_currents = ARRAY_SIZE(ls3_currents);
218 struct tps65218 *tps = rdev_get_drvdata(dev);
219
220 while (index < num_currents && ls3_currents[index] < max_uA)
221 index++;
222
223 index--;
224
225 if (index < 0 || ls3_currents[index] < min_uA)
226 return -EINVAL;
227
228 return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
229 index << 2, TPS65218_PROTECT_L1);
230}
231
232static int tps65218_pmic_get_current_limit(struct regulator_dev *dev)
233{
234 int retval;
235 unsigned int index;
236 struct tps65218 *tps = rdev_get_drvdata(dev);
237
238 retval = regmap_read(tps->regmap, dev->desc->csel_reg, &index);
239 if (retval < 0)
240 return retval;
241
242 index = (index & dev->desc->csel_mask) >> 2;
243
244 return ls3_currents[index];
245}
246
247static struct regulator_ops tps65218_ls3_ops = {
248 .is_enabled = regulator_is_enabled_regmap,
249 .enable = tps65218_pmic_enable,
250 .disable = tps65218_pmic_disable,
251 .set_input_current_limit = tps65218_pmic_set_input_current_lim,
252 .set_current_limit = tps65218_pmic_set_current_limit,
253 .get_current_limit = tps65218_pmic_get_current_limit,
254};
255
256/* Operations permitted on DCDC5, DCDC6 */
257static struct regulator_ops tps65218_dcdc56_pmic_ops = {
258 .is_enabled = regulator_is_enabled_regmap,
259 .enable = tps65218_pmic_enable,
260 .disable = tps65218_pmic_disable,
261 .set_suspend_enable = tps65218_pmic_set_suspend_enable,
262 .set_suspend_disable = tps65218_pmic_set_suspend_disable,
263};
264
265static const struct regulator_desc regulators[] = {
266 TPS65218_REGULATOR("DCDC1", "regulator-dcdc1", TPS65218_DCDC_1,
267 REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
268 TPS65218_REG_CONTROL_DCDC1,
269 TPS65218_CONTROL_DCDC1_MASK, TPS65218_REG_ENABLE1,
270 TPS65218_ENABLE1_DC1_EN, 0, 0, dcdc1_dcdc2_ranges,
271 2, 4000, 0, TPS65218_REG_SEQ3,
272 TPS65218_SEQ3_DC1_SEQ_MASK),
273 TPS65218_REGULATOR("DCDC2", "regulator-dcdc2", TPS65218_DCDC_2,
274 REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
275 TPS65218_REG_CONTROL_DCDC2,
276 TPS65218_CONTROL_DCDC2_MASK, TPS65218_REG_ENABLE1,
277 TPS65218_ENABLE1_DC2_EN, 0, 0, dcdc1_dcdc2_ranges,
278 2, 4000, 0, TPS65218_REG_SEQ3,
279 TPS65218_SEQ3_DC2_SEQ_MASK),
280 TPS65218_REGULATOR("DCDC3", "regulator-dcdc3", TPS65218_DCDC_3,
281 REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
282 TPS65218_REG_CONTROL_DCDC3,
283 TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
284 TPS65218_ENABLE1_DC3_EN, 0, 0, ldo1_dcdc3_ranges, 2,
285 0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC3_SEQ_MASK),
286 TPS65218_REGULATOR("DCDC4", "regulator-dcdc4", TPS65218_DCDC_4,
287 REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 53,
288 TPS65218_REG_CONTROL_DCDC4,
289 TPS65218_CONTROL_DCDC4_MASK, TPS65218_REG_ENABLE1,
290 TPS65218_ENABLE1_DC4_EN, 0, 0, dcdc4_ranges, 2,
291 0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC4_SEQ_MASK),
292 TPS65218_REGULATOR("DCDC5", "regulator-dcdc5", TPS65218_DCDC_5,
293 REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
294 -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC5_EN, 0,
295 0, NULL, 0, 0, 1000000, TPS65218_REG_SEQ5,
296 TPS65218_SEQ5_DC5_SEQ_MASK),
297 TPS65218_REGULATOR("DCDC6", "regulator-dcdc6", TPS65218_DCDC_6,
298 REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
299 -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC6_EN, 0,
300 0, NULL, 0, 0, 1800000, TPS65218_REG_SEQ5,
301 TPS65218_SEQ5_DC6_SEQ_MASK),
302 TPS65218_REGULATOR("LDO1", "regulator-ldo1", TPS65218_LDO_1,
303 REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
304 TPS65218_REG_CONTROL_LDO1,
305 TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
306 TPS65218_ENABLE2_LDO1_EN, 0, 0, ldo1_dcdc3_ranges,
307 2, 0, 0, TPS65218_REG_SEQ6,
308 TPS65218_SEQ6_LDO1_SEQ_MASK),
309 TPS65218_REGULATOR("LS3", "regulator-ls3", TPS65218_LS_3,
310 REGULATOR_CURRENT, tps65218_ls3_ops, 0, 0, 0,
311 TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS3_EN,
312 TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS3ILIM_MASK,
313 NULL, 0, 0, 0, 0, 0),
314};
315
316static int tps65218_regulator_probe(struct platform_device *pdev)
317{
318 struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
319 struct regulator_dev *rdev;
320 struct regulator_config config = { };
321 int i, ret;
322 unsigned int val;
323
324 config.dev = &pdev->dev;
325 config.dev->of_node = tps->dev->of_node;
326 config.driver_data = tps;
327 config.regmap = tps->regmap;
328
329 /* Allocate memory for strobes */
330 tps->strobes = devm_kzalloc(&pdev->dev, sizeof(u8) *
331 TPS65218_NUM_REGULATOR, GFP_KERNEL);
332
333 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
334 rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
335 &config);
336 if (IS_ERR(rdev)) {
337 dev_err(tps->dev, "failed to register %s regulator\n",
338 pdev->name);
339 return PTR_ERR(rdev);
340 }
341
342 ret = regmap_read(tps->regmap, regulators[i].bypass_reg, &val);
343 if (ret)
344 return ret;
345
346 tps->strobes[i] = val & regulators[i].bypass_mask;
347 }
348
349 return 0;
350}
351
352static const struct platform_device_id tps65218_regulator_id_table[] = {
353 { "tps65218-regulator", },
354 { /* sentinel */ }
355};
356MODULE_DEVICE_TABLE(platform, tps65218_regulator_id_table);
357
358static struct platform_driver tps65218_regulator_driver = {
359 .driver = {
360 .name = "tps65218-pmic",
361 },
362 .probe = tps65218_regulator_probe,
363 .id_table = tps65218_regulator_id_table,
364};
365
366module_platform_driver(tps65218_regulator_driver);
367
368MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
369MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
370MODULE_ALIAS("platform:tps65218-pmic");
371MODULE_LICENSE("GPL v2");