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Linux/drivers/regulator/tps65218-regulator.c

  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 enum 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 
 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->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 */
168 static 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 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 int ls3_currents[] = { 100, 200, 500, 1000 };
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 << 2, TPS65218_PROTECT_L1);
211 }
212 
213 static 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 
232 static 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 
247 static 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 */
257 static 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 
265 static 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 
316 static 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, &regulators[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 
352 static const struct platform_device_id tps65218_regulator_id_table[] = {
353         { "tps65218-regulator", },
354         { /* sentinel */ }
355 };
356 MODULE_DEVICE_TABLE(platform, tps65218_regulator_id_table);
357 
358 static 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 
366 module_platform_driver(tps65218_regulator_driver);
367 
368 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
369 MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
370 MODULE_ALIAS("platform:tps65218-pmic");
371 MODULE_LICENSE("GPL v2");
372 

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