1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2024 ROHM Semiconductors
3 // bd96801-regulator.c ROHM BD96801 regulator driver
4
5 /*
6 * This version of the "BD86801 scalable PMIC"'s driver supports only very
7 * basic set of the PMIC features. Most notably, there is no support for
8 * the ERRB interrupt and the configurations which should be done when the
9 * PMIC is in STBY mode.
10 *
11 * Supporting the ERRB interrupt would require dropping the regmap-IRQ
12 * usage or working around (or accepting a presense of) a naming conflict
13 * in debugFS IRQs.
14 *
15 * Being able to reliably do the configurations like changing the
16 * regulator safety limits (like limits for the over/under -voltages, over
17 * current, thermal protection) would require the configuring driver to be
18 * synchronized with entity causing the PMIC state transitions. Eg, one
19 * should be able to ensure the PMIC is in STBY state when the
20 * configurations are applied to the hardware. How and when the PMIC state
21 * transitions are to be done is likely to be very system specific, as will
22 * be the need to configure these safety limits. Hence it's not simple to
23 * come up with a generic solution.
24 *
25 * Users who require the ERRB handling and STBY state configurations can
26 * have a look at the original RFC:
27 * https://lore.kernel.org/all/cover.1712920132.git.mazziesaccount@gmail.com/
28 * which implements a workaround to debugFS naming conflict and some of
29 * the safety limit configurations - but leaves the state change handling
30 * and synchronization to be implemented.
31 *
32 * It would be great to hear (and receive a patch!) if you implement the
33 * STBY configuration support or a proper fix to the debugFS naming
34 * conflict in your downstream driver ;)
35 */
36
37 #include <linux/cleanup.h>
38 #include <linux/delay.h>
39 #include <linux/err.h>
40 #include <linux/interrupt.h>
41 #include <linux/kernel.h>
42 #include <linux/linear_range.h>
43 #include <linux/mfd/rohm-generic.h>
44 #include <linux/mfd/rohm-bd96801.h>
45 #include <linux/module.h>
46 #include <linux/of.h>
47 #include <linux/platform_device.h>
48 #include <linux/regmap.h>
49 #include <linux/regulator/coupler.h>
50 #include <linux/regulator/driver.h>
51 #include <linux/regulator/machine.h>
52 #include <linux/regulator/of_regulator.h>
53 #include <linux/slab.h>
54 #include <linux/timer.h>
55
56 enum {
57 BD96801_BUCK1,
58 BD96801_BUCK2,
59 BD96801_BUCK3,
60 BD96801_BUCK4,
61 BD96801_LDO5,
62 BD96801_LDO6,
63 BD96801_LDO7,
64 BD96801_REGULATOR_AMOUNT,
65 };
66
67 enum {
68 BD96801_PROT_OVP,
69 BD96801_PROT_UVP,
70 BD96801_PROT_OCP,
71 BD96801_PROT_TEMP,
72 BD96801_NUM_PROT,
73 };
74
75 #define BD96801_ALWAYS_ON_REG 0x3c
76 #define BD96801_REG_ENABLE 0x0b
77 #define BD96801_BUCK1_EN_MASK BIT(0)
78 #define BD96801_BUCK2_EN_MASK BIT(1)
79 #define BD96801_BUCK3_EN_MASK BIT(2)
80 #define BD96801_BUCK4_EN_MASK BIT(3)
81 #define BD96801_LDO5_EN_MASK BIT(4)
82 #define BD96801_LDO6_EN_MASK BIT(5)
83 #define BD96801_LDO7_EN_MASK BIT(6)
84
85 #define BD96801_BUCK1_VSEL_REG 0x28
86 #define BD96801_BUCK2_VSEL_REG 0x29
87 #define BD96801_BUCK3_VSEL_REG 0x2a
88 #define BD96801_BUCK4_VSEL_REG 0x2b
89 #define BD96801_LDO5_VSEL_REG 0x25
90 #define BD96801_LDO6_VSEL_REG 0x26
91 #define BD96801_LDO7_VSEL_REG 0x27
92 #define BD96801_BUCK_VSEL_MASK 0x1F
93 #define BD96801_LDO_VSEL_MASK 0xff
94
95 #define BD96801_MASK_RAMP_DELAY 0xc0
96 #define BD96801_INT_VOUT_BASE_REG 0x21
97 #define BD96801_BUCK_INT_VOUT_MASK 0xff
98
99 #define BD96801_BUCK_VOLTS 256
100 #define BD96801_LDO_VOLTS 256
101
102 #define BD96801_OVP_MASK 0x03
103 #define BD96801_MASK_BUCK1_OVP_SHIFT 0x00
104 #define BD96801_MASK_BUCK2_OVP_SHIFT 0x02
105 #define BD96801_MASK_BUCK3_OVP_SHIFT 0x04
106 #define BD96801_MASK_BUCK4_OVP_SHIFT 0x06
107 #define BD96801_MASK_LDO5_OVP_SHIFT 0x00
108 #define BD96801_MASK_LDO6_OVP_SHIFT 0x02
109 #define BD96801_MASK_LDO7_OVP_SHIFT 0x04
110
111 #define BD96801_PROT_LIMIT_OCP_MIN 0x00
112 #define BD96801_PROT_LIMIT_LOW 0x01
113 #define BD96801_PROT_LIMIT_MID 0x02
114 #define BD96801_PROT_LIMIT_HI 0x03
115
116 #define BD96801_REG_BUCK1_OCP 0x32
117 #define BD96801_REG_BUCK2_OCP 0x32
118 #define BD96801_REG_BUCK3_OCP 0x33
119 #define BD96801_REG_BUCK4_OCP 0x33
120
121 #define BD96801_MASK_BUCK1_OCP_SHIFT 0x00
122 #define BD96801_MASK_BUCK2_OCP_SHIFT 0x04
123 #define BD96801_MASK_BUCK3_OCP_SHIFT 0x00
124 #define BD96801_MASK_BUCK4_OCP_SHIFT 0x04
125
126 #define BD96801_REG_LDO5_OCP 0x34
127 #define BD96801_REG_LDO6_OCP 0x34
128 #define BD96801_REG_LDO7_OCP 0x34
129
130 #define BD96801_MASK_LDO5_OCP_SHIFT 0x00
131 #define BD96801_MASK_LDO6_OCP_SHIFT 0x02
132 #define BD96801_MASK_LDO7_OCP_SHIFT 0x04
133
134 #define BD96801_MASK_SHD_INTB BIT(7)
135 #define BD96801_INTB_FATAL BIT(7)
136
137 #define BD96801_NUM_REGULATORS 7
138 #define BD96801_NUM_LDOS 4
139
140 /*
141 * Ramp rates for bucks are controlled by bits [7:6] as follows:
142 * 00 => 1 mV/uS
143 * 01 => 5 mV/uS
144 * 10 => 10 mV/uS
145 * 11 => 20 mV/uS
146 */
147 static const unsigned int buck_ramp_table[] = { 1000, 5000, 10000, 20000 };
148
149 /*
150 * This is a voltage range that get's appended to selected
151 * bd96801_buck_init_volts value. The range from 0x0 to 0xF is actually
152 * bd96801_buck_init_volts + 0 ... bd96801_buck_init_volts + 150mV
153 * and the range from 0x10 to 0x1f is bd96801_buck_init_volts - 150mV ...
154 * bd96801_buck_init_volts - 0. But as the members of linear_range
155 * are all unsigned I will apply offset of -150 mV to value in
156 * linear_range - which should increase these ranges with
157 * 150 mV getting all the values to >= 0.
158 */
159 static const struct linear_range bd96801_tune_volts[] = {
160 REGULATOR_LINEAR_RANGE(150000, 0x00, 0xF, 10000),
161 REGULATOR_LINEAR_RANGE(0, 0x10, 0x1F, 10000),
162 };
163
164 static const struct linear_range bd96801_buck_init_volts[] = {
165 REGULATOR_LINEAR_RANGE(500000 - 150000, 0x00, 0xc8, 5000),
166 REGULATOR_LINEAR_RANGE(1550000 - 150000, 0xc9, 0xec, 50000),
167 REGULATOR_LINEAR_RANGE(3300000 - 150000, 0xed, 0xff, 0),
168 };
169
170 static const struct linear_range bd96801_ldo_int_volts[] = {
171 REGULATOR_LINEAR_RANGE(300000, 0x00, 0x78, 25000),
172 REGULATOR_LINEAR_RANGE(3300000, 0x79, 0xff, 0),
173 };
174
175 #define BD96801_LDO_SD_VOLT_MASK 0x1
176 #define BD96801_LDO_MODE_MASK 0x6
177 #define BD96801_LDO_MODE_INT 0x0
178 #define BD96801_LDO_MODE_SD 0x2
179 #define BD96801_LDO_MODE_DDR 0x4
180
181 static int ldo_ddr_volt_table[] = {500000, 300000};
182 static int ldo_sd_volt_table[] = {3300000, 1800000};
183
184 /* Constant IRQ initialization data (templates) */
185 struct bd96801_irqinfo {
186 int type;
187 struct regulator_irq_desc irq_desc;
188 int err_cfg;
189 int wrn_cfg;
190 const char *irq_name;
191 };
192
193 #define BD96801_IRQINFO(_type, _name, _irqoff_ms, _irqname) \
194 { \
195 .type = (_type), \
196 .err_cfg = -1, \
197 .wrn_cfg = -1, \
198 .irq_name = (_irqname), \
199 .irq_desc = { \
200 .name = (_name), \
201 .irq_off_ms = (_irqoff_ms), \
202 .map_event = regulator_irq_map_event_simple, \
203 }, \
204 }
205
206 static const struct bd96801_irqinfo buck1_irqinfo[] = {
207 BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-h", 500,
208 "bd96801-buck1-overcurr-h"),
209 BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-l", 500,
210 "bd96801-buck1-overcurr-l"),
211 BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-n", 500,
212 "bd96801-buck1-overcurr-n"),
213 BD96801_IRQINFO(BD96801_PROT_OVP, "buck1-over-voltage", 500,
214 "bd96801-buck1-overvolt"),
215 BD96801_IRQINFO(BD96801_PROT_UVP, "buck1-under-voltage", 500,
216 "bd96801-buck1-undervolt"),
217 BD96801_IRQINFO(BD96801_PROT_TEMP, "buck1-over-temp", 500,
218 "bd96801-buck1-thermal")
219 };
220
221 static const struct bd96801_irqinfo buck2_irqinfo[] = {
222 BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-h", 500,
223 "bd96801-buck2-overcurr-h"),
224 BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-l", 500,
225 "bd96801-buck2-overcurr-l"),
226 BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-n", 500,
227 "bd96801-buck2-overcurr-n"),
228 BD96801_IRQINFO(BD96801_PROT_OVP, "buck2-over-voltage", 500,
229 "bd96801-buck2-overvolt"),
230 BD96801_IRQINFO(BD96801_PROT_UVP, "buck2-under-voltage", 500,
231 "bd96801-buck2-undervolt"),
232 BD96801_IRQINFO(BD96801_PROT_TEMP, "buck2-over-temp", 500,
233 "bd96801-buck2-thermal")
234 };
235
236 static const struct bd96801_irqinfo buck3_irqinfo[] = {
237 BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-h", 500,
238 "bd96801-buck3-overcurr-h"),
239 BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-l", 500,
240 "bd96801-buck3-overcurr-l"),
241 BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-n", 500,
242 "bd96801-buck3-overcurr-n"),
243 BD96801_IRQINFO(BD96801_PROT_OVP, "buck3-over-voltage", 500,
244 "bd96801-buck3-overvolt"),
245 BD96801_IRQINFO(BD96801_PROT_UVP, "buck3-under-voltage", 500,
246 "bd96801-buck3-undervolt"),
247 BD96801_IRQINFO(BD96801_PROT_TEMP, "buck3-over-temp", 500,
248 "bd96801-buck3-thermal")
249 };
250
251 static const struct bd96801_irqinfo buck4_irqinfo[] = {
252 BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-h", 500,
253 "bd96801-buck4-overcurr-h"),
254 BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-l", 500,
255 "bd96801-buck4-overcurr-l"),
256 BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-n", 500,
257 "bd96801-buck4-overcurr-n"),
258 BD96801_IRQINFO(BD96801_PROT_OVP, "buck4-over-voltage", 500,
259 "bd96801-buck4-overvolt"),
260 BD96801_IRQINFO(BD96801_PROT_UVP, "buck4-under-voltage", 500,
261 "bd96801-buck4-undervolt"),
262 BD96801_IRQINFO(BD96801_PROT_TEMP, "buck4-over-temp", 500,
263 "bd96801-buck4-thermal")
264 };
265
266 static const struct bd96801_irqinfo ldo5_irqinfo[] = {
267 BD96801_IRQINFO(BD96801_PROT_OCP, "ldo5-overcurr", 500,
268 "bd96801-ldo5-overcurr"),
269 BD96801_IRQINFO(BD96801_PROT_OVP, "ldo5-over-voltage", 500,
270 "bd96801-ldo5-overvolt"),
271 BD96801_IRQINFO(BD96801_PROT_UVP, "ldo5-under-voltage", 500,
272 "bd96801-ldo5-undervolt"),
273 };
274
275 static const struct bd96801_irqinfo ldo6_irqinfo[] = {
276 BD96801_IRQINFO(BD96801_PROT_OCP, "ldo6-overcurr", 500,
277 "bd96801-ldo6-overcurr"),
278 BD96801_IRQINFO(BD96801_PROT_OVP, "ldo6-over-voltage", 500,
279 "bd96801-ldo6-overvolt"),
280 BD96801_IRQINFO(BD96801_PROT_UVP, "ldo6-under-voltage", 500,
281 "bd96801-ldo6-undervolt"),
282 };
283
284 static const struct bd96801_irqinfo ldo7_irqinfo[] = {
285 BD96801_IRQINFO(BD96801_PROT_OCP, "ldo7-overcurr", 500,
286 "bd96801-ldo7-overcurr"),
287 BD96801_IRQINFO(BD96801_PROT_OVP, "ldo7-over-voltage", 500,
288 "bd96801-ldo7-overvolt"),
289 BD96801_IRQINFO(BD96801_PROT_UVP, "ldo7-under-voltage", 500,
290 "bd96801-ldo7-undervolt"),
291 };
292
293 struct bd96801_irq_desc {
294 struct bd96801_irqinfo *irqinfo;
295 int num_irqs;
296 };
297
298 struct bd96801_regulator_data {
299 struct regulator_desc desc;
300 const struct linear_range *init_ranges;
301 int num_ranges;
302 struct bd96801_irq_desc irq_desc;
303 int initial_voltage;
304 int ldo_vol_lvl;
305 int ldo_errs;
306 };
307
308 struct bd96801_pmic_data {
309 struct bd96801_regulator_data regulator_data[BD96801_NUM_REGULATORS];
310 struct regmap *regmap;
311 int fatal_ind;
312 };
313
ldo_map_notif(int irq,struct regulator_irq_data * rid,unsigned long * dev_mask)314 static int ldo_map_notif(int irq, struct regulator_irq_data *rid,
315 unsigned long *dev_mask)
316 {
317 int i;
318
319 for (i = 0; i < rid->num_states; i++) {
320 struct bd96801_regulator_data *rdata;
321 struct regulator_dev *rdev;
322
323 rdev = rid->states[i].rdev;
324 rdata = container_of(rdev->desc, struct bd96801_regulator_data,
325 desc);
326 rid->states[i].notifs = regulator_err2notif(rdata->ldo_errs);
327 rid->states[i].errors = rdata->ldo_errs;
328 *dev_mask |= BIT(i);
329 }
330 return 0;
331 }
332
bd96801_list_voltage_lr(struct regulator_dev * rdev,unsigned int selector)333 static int bd96801_list_voltage_lr(struct regulator_dev *rdev,
334 unsigned int selector)
335 {
336 int voltage;
337 struct bd96801_regulator_data *data;
338
339 data = container_of(rdev->desc, struct bd96801_regulator_data, desc);
340
341 /*
342 * The BD096801 has voltage setting in two registers. One giving the
343 * "initial voltage" (can be changed only when regulator is disabled.
344 * This driver caches the value and sets it only at startup. The other
345 * register is voltage tuning value which applies -150 mV ... +150 mV
346 * offset to the voltage.
347 *
348 * Note that the cached initial voltage stored in regulator data is
349 * 'scaled down' by the 150 mV so that all of our tuning values are
350 * >= 0. This is done because the linear_ranges uses unsigned values.
351 *
352 * As a result, we increase the tuning voltage which we get based on
353 * the selector by the stored initial_voltage.
354 */
355 voltage = regulator_list_voltage_linear_range(rdev, selector);
356 if (voltage < 0)
357 return voltage;
358
359 return voltage + data->initial_voltage;
360 }
361
362
363 static const struct regulator_ops bd96801_ldo_table_ops = {
364 .is_enabled = regulator_is_enabled_regmap,
365 .list_voltage = regulator_list_voltage_table,
366 .get_voltage_sel = regulator_get_voltage_sel_regmap,
367 };
368
369 static const struct regulator_ops bd96801_buck_ops = {
370 .is_enabled = regulator_is_enabled_regmap,
371 .list_voltage = bd96801_list_voltage_lr,
372 .set_voltage_sel = regulator_set_voltage_sel_regmap,
373 .get_voltage_sel = regulator_get_voltage_sel_regmap,
374 .set_voltage_time_sel = regulator_set_voltage_time_sel,
375 .set_ramp_delay = regulator_set_ramp_delay_regmap,
376 };
377
378 static const struct regulator_ops bd96801_ldo_ops = {
379 .is_enabled = regulator_is_enabled_regmap,
380 .list_voltage = regulator_list_voltage_linear_range,
381 .get_voltage_sel = regulator_get_voltage_sel_regmap,
382 };
383
buck_get_initial_voltage(struct regmap * regmap,struct device * dev,struct bd96801_regulator_data * data)384 static int buck_get_initial_voltage(struct regmap *regmap, struct device *dev,
385 struct bd96801_regulator_data *data)
386 {
387 int ret = 0, sel, initial_uv;
388 int reg = BD96801_INT_VOUT_BASE_REG + data->desc.id;
389
390 if (data->num_ranges) {
391 ret = regmap_read(regmap, reg, &sel);
392 sel &= BD96801_BUCK_INT_VOUT_MASK;
393
394 ret = linear_range_get_value_array(data->init_ranges,
395 data->num_ranges, sel,
396 &initial_uv);
397 if (ret)
398 return ret;
399
400 data->initial_voltage = initial_uv;
401 dev_dbg(dev, "Tune-scaled initial voltage %u\n",
402 data->initial_voltage);
403 }
404
405 return 0;
406 }
407
get_ldo_initial_voltage(struct regmap * regmap,struct device * dev,struct bd96801_regulator_data * data)408 static int get_ldo_initial_voltage(struct regmap *regmap,
409 struct device *dev,
410 struct bd96801_regulator_data *data)
411 {
412 int ret;
413 int cfgreg;
414
415 ret = regmap_read(regmap, data->ldo_vol_lvl, &cfgreg);
416 if (ret)
417 return ret;
418
419 switch (cfgreg & BD96801_LDO_MODE_MASK) {
420 case BD96801_LDO_MODE_DDR:
421 data->desc.volt_table = ldo_ddr_volt_table;
422 data->desc.n_voltages = ARRAY_SIZE(ldo_ddr_volt_table);
423 break;
424 case BD96801_LDO_MODE_SD:
425 data->desc.volt_table = ldo_sd_volt_table;
426 data->desc.n_voltages = ARRAY_SIZE(ldo_sd_volt_table);
427 break;
428 default:
429 dev_info(dev, "Leaving LDO to normal mode");
430 return 0;
431 }
432
433 /* SD or DDR mode => override default ops */
434 data->desc.ops = &bd96801_ldo_table_ops,
435 data->desc.vsel_mask = 1;
436 data->desc.vsel_reg = data->ldo_vol_lvl;
437
438 return 0;
439 }
440
get_initial_voltage(struct device * dev,struct regmap * regmap,struct bd96801_regulator_data * data)441 static int get_initial_voltage(struct device *dev, struct regmap *regmap,
442 struct bd96801_regulator_data *data)
443 {
444 /* BUCK */
445 if (data->desc.id <= BD96801_BUCK4)
446 return buck_get_initial_voltage(regmap, dev, data);
447
448 /* LDO */
449 return get_ldo_initial_voltage(regmap, dev, data);
450 }
451
bd96801_walk_regulator_dt(struct device * dev,struct regmap * regmap,struct bd96801_regulator_data * data,int num)452 static int bd96801_walk_regulator_dt(struct device *dev, struct regmap *regmap,
453 struct bd96801_regulator_data *data,
454 int num)
455 {
456 int i, ret;
457
458 struct device_node *nproot __free(device_node) =
459 of_get_child_by_name(dev->parent->of_node, "regulators");
460 if (!nproot) {
461 dev_err(dev, "failed to find regulators node\n");
462 return -ENODEV;
463 }
464 for_each_child_of_node_scoped(nproot, np) {
465 for (i = 0; i < num; i++) {
466 if (!of_node_name_eq(np, data[i].desc.of_match))
467 continue;
468 /*
469 * If STBY configs are supported, we must pass node
470 * here to extract the initial voltages from the DT.
471 * Thus we do the initial voltage getting in this
472 * loop.
473 */
474 ret = get_initial_voltage(dev, regmap, &data[i]);
475 if (ret) {
476 dev_err(dev,
477 "Initializing voltages for %s failed\n",
478 data[i].desc.name);
479 return ret;
480 }
481
482 if (of_property_read_bool(np, "rohm,keep-on-stby")) {
483 ret = regmap_set_bits(regmap,
484 BD96801_ALWAYS_ON_REG,
485 1 << data[i].desc.id);
486 if (ret) {
487 dev_err(dev,
488 "failed to set %s on-at-stby\n",
489 data[i].desc.name);
490 return ret;
491 }
492 }
493 }
494 }
495
496 return 0;
497 }
498
499 /*
500 * Template for regulator data. Probe will allocate dynamic / driver instance
501 * struct so we should be on a safe side even if there were multiple PMICs to
502 * control. Note that there is a plan to allow multiple PMICs to be used so
503 * systems can scale better. I am however still slightly unsure how the
504 * multi-PMIC case will be handled. I don't know if the processor will have I2C
505 * acces to all of the PMICs or only the first one. I'd guess there will be
506 * access provided to all PMICs for voltage scaling - but the errors will only
507 * be informed via the master PMIC. Eg, we should prepare to support multiple
508 * driver instances - either with or without the IRQs... Well, let's first
509 * just support the simple and clear single-PMIC setup and ponder the multi PMIC
510 * case later. What we can easly do for preparing is to not use static global
511 * data for regulators though.
512 */
513 static const struct bd96801_pmic_data bd96801_data = {
514 .regulator_data = {
515 {
516 .desc = {
517 .name = "buck1",
518 .of_match = of_match_ptr("buck1"),
519 .regulators_node = of_match_ptr("regulators"),
520 .id = BD96801_BUCK1,
521 .ops = &bd96801_buck_ops,
522 .type = REGULATOR_VOLTAGE,
523 .linear_ranges = bd96801_tune_volts,
524 .n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
525 .n_voltages = BD96801_BUCK_VOLTS,
526 .enable_reg = BD96801_REG_ENABLE,
527 .enable_mask = BD96801_BUCK1_EN_MASK,
528 .enable_is_inverted = true,
529 .vsel_reg = BD96801_BUCK1_VSEL_REG,
530 .vsel_mask = BD96801_BUCK_VSEL_MASK,
531 .ramp_reg = BD96801_BUCK1_VSEL_REG,
532 .ramp_mask = BD96801_MASK_RAMP_DELAY,
533 .ramp_delay_table = &buck_ramp_table[0],
534 .n_ramp_values = ARRAY_SIZE(buck_ramp_table),
535 .owner = THIS_MODULE,
536 },
537 .init_ranges = bd96801_buck_init_volts,
538 .num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
539 .irq_desc = {
540 .irqinfo = (struct bd96801_irqinfo *)&buck1_irqinfo[0],
541 .num_irqs = ARRAY_SIZE(buck1_irqinfo),
542 },
543 }, {
544 .desc = {
545 .name = "buck2",
546 .of_match = of_match_ptr("buck2"),
547 .regulators_node = of_match_ptr("regulators"),
548 .id = BD96801_BUCK2,
549 .ops = &bd96801_buck_ops,
550 .type = REGULATOR_VOLTAGE,
551 .linear_ranges = bd96801_tune_volts,
552 .n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
553 .n_voltages = BD96801_BUCK_VOLTS,
554 .enable_reg = BD96801_REG_ENABLE,
555 .enable_mask = BD96801_BUCK2_EN_MASK,
556 .enable_is_inverted = true,
557 .vsel_reg = BD96801_BUCK2_VSEL_REG,
558 .vsel_mask = BD96801_BUCK_VSEL_MASK,
559 .ramp_reg = BD96801_BUCK2_VSEL_REG,
560 .ramp_mask = BD96801_MASK_RAMP_DELAY,
561 .ramp_delay_table = &buck_ramp_table[0],
562 .n_ramp_values = ARRAY_SIZE(buck_ramp_table),
563 .owner = THIS_MODULE,
564 },
565 .irq_desc = {
566 .irqinfo = (struct bd96801_irqinfo *)&buck2_irqinfo[0],
567 .num_irqs = ARRAY_SIZE(buck2_irqinfo),
568 },
569 .init_ranges = bd96801_buck_init_volts,
570 .num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
571 }, {
572 .desc = {
573 .name = "buck3",
574 .of_match = of_match_ptr("buck3"),
575 .regulators_node = of_match_ptr("regulators"),
576 .id = BD96801_BUCK3,
577 .ops = &bd96801_buck_ops,
578 .type = REGULATOR_VOLTAGE,
579 .linear_ranges = bd96801_tune_volts,
580 .n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
581 .n_voltages = BD96801_BUCK_VOLTS,
582 .enable_reg = BD96801_REG_ENABLE,
583 .enable_mask = BD96801_BUCK3_EN_MASK,
584 .enable_is_inverted = true,
585 .vsel_reg = BD96801_BUCK3_VSEL_REG,
586 .vsel_mask = BD96801_BUCK_VSEL_MASK,
587 .ramp_reg = BD96801_BUCK3_VSEL_REG,
588 .ramp_mask = BD96801_MASK_RAMP_DELAY,
589 .ramp_delay_table = &buck_ramp_table[0],
590 .n_ramp_values = ARRAY_SIZE(buck_ramp_table),
591 .owner = THIS_MODULE,
592 },
593 .irq_desc = {
594 .irqinfo = (struct bd96801_irqinfo *)&buck3_irqinfo[0],
595 .num_irqs = ARRAY_SIZE(buck3_irqinfo),
596 },
597 .init_ranges = bd96801_buck_init_volts,
598 .num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
599 }, {
600 .desc = {
601 .name = "buck4",
602 .of_match = of_match_ptr("buck4"),
603 .regulators_node = of_match_ptr("regulators"),
604 .id = BD96801_BUCK4,
605 .ops = &bd96801_buck_ops,
606 .type = REGULATOR_VOLTAGE,
607 .linear_ranges = bd96801_tune_volts,
608 .n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
609 .n_voltages = BD96801_BUCK_VOLTS,
610 .enable_reg = BD96801_REG_ENABLE,
611 .enable_mask = BD96801_BUCK4_EN_MASK,
612 .enable_is_inverted = true,
613 .vsel_reg = BD96801_BUCK4_VSEL_REG,
614 .vsel_mask = BD96801_BUCK_VSEL_MASK,
615 .ramp_reg = BD96801_BUCK4_VSEL_REG,
616 .ramp_mask = BD96801_MASK_RAMP_DELAY,
617 .ramp_delay_table = &buck_ramp_table[0],
618 .n_ramp_values = ARRAY_SIZE(buck_ramp_table),
619 .owner = THIS_MODULE,
620 },
621 .irq_desc = {
622 .irqinfo = (struct bd96801_irqinfo *)&buck4_irqinfo[0],
623 .num_irqs = ARRAY_SIZE(buck4_irqinfo),
624 },
625 .init_ranges = bd96801_buck_init_volts,
626 .num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
627 }, {
628 .desc = {
629 .name = "ldo5",
630 .of_match = of_match_ptr("ldo5"),
631 .regulators_node = of_match_ptr("regulators"),
632 .id = BD96801_LDO5,
633 .ops = &bd96801_ldo_ops,
634 .type = REGULATOR_VOLTAGE,
635 .linear_ranges = bd96801_ldo_int_volts,
636 .n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
637 .n_voltages = BD96801_LDO_VOLTS,
638 .enable_reg = BD96801_REG_ENABLE,
639 .enable_mask = BD96801_LDO5_EN_MASK,
640 .enable_is_inverted = true,
641 .vsel_reg = BD96801_LDO5_VSEL_REG,
642 .vsel_mask = BD96801_LDO_VSEL_MASK,
643 .owner = THIS_MODULE,
644 },
645 .irq_desc = {
646 .irqinfo = (struct bd96801_irqinfo *)&ldo5_irqinfo[0],
647 .num_irqs = ARRAY_SIZE(ldo5_irqinfo),
648 },
649 .ldo_vol_lvl = BD96801_LDO5_VOL_LVL_REG,
650 }, {
651 .desc = {
652 .name = "ldo6",
653 .of_match = of_match_ptr("ldo6"),
654 .regulators_node = of_match_ptr("regulators"),
655 .id = BD96801_LDO6,
656 .ops = &bd96801_ldo_ops,
657 .type = REGULATOR_VOLTAGE,
658 .linear_ranges = bd96801_ldo_int_volts,
659 .n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
660 .n_voltages = BD96801_LDO_VOLTS,
661 .enable_reg = BD96801_REG_ENABLE,
662 .enable_mask = BD96801_LDO6_EN_MASK,
663 .enable_is_inverted = true,
664 .vsel_reg = BD96801_LDO6_VSEL_REG,
665 .vsel_mask = BD96801_LDO_VSEL_MASK,
666 .owner = THIS_MODULE,
667 },
668 .irq_desc = {
669 .irqinfo = (struct bd96801_irqinfo *)&ldo6_irqinfo[0],
670 .num_irqs = ARRAY_SIZE(ldo6_irqinfo),
671 },
672 .ldo_vol_lvl = BD96801_LDO6_VOL_LVL_REG,
673 }, {
674 .desc = {
675 .name = "ldo7",
676 .of_match = of_match_ptr("ldo7"),
677 .regulators_node = of_match_ptr("regulators"),
678 .id = BD96801_LDO7,
679 .ops = &bd96801_ldo_ops,
680 .type = REGULATOR_VOLTAGE,
681 .linear_ranges = bd96801_ldo_int_volts,
682 .n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
683 .n_voltages = BD96801_LDO_VOLTS,
684 .enable_reg = BD96801_REG_ENABLE,
685 .enable_mask = BD96801_LDO7_EN_MASK,
686 .enable_is_inverted = true,
687 .vsel_reg = BD96801_LDO7_VSEL_REG,
688 .vsel_mask = BD96801_LDO_VSEL_MASK,
689 .owner = THIS_MODULE,
690 },
691 .irq_desc = {
692 .irqinfo = (struct bd96801_irqinfo *)&ldo7_irqinfo[0],
693 .num_irqs = ARRAY_SIZE(ldo7_irqinfo),
694 },
695 .ldo_vol_lvl = BD96801_LDO7_VOL_LVL_REG,
696 },
697 },
698 };
699
initialize_pmic_data(struct device * dev,struct bd96801_pmic_data * pdata)700 static int initialize_pmic_data(struct device *dev,
701 struct bd96801_pmic_data *pdata)
702 {
703 int r, i;
704
705 /*
706 * Allocate and initialize IRQ data for all of the regulators. We
707 * wish to modify IRQ information independently for each driver
708 * instance.
709 */
710 for (r = 0; r < BD96801_NUM_REGULATORS; r++) {
711 const struct bd96801_irqinfo *template;
712 struct bd96801_irqinfo *new;
713 int num_infos;
714
715 template = pdata->regulator_data[r].irq_desc.irqinfo;
716 num_infos = pdata->regulator_data[r].irq_desc.num_irqs;
717
718 new = devm_kcalloc(dev, num_infos, sizeof(*new), GFP_KERNEL);
719 if (!new)
720 return -ENOMEM;
721
722 pdata->regulator_data[r].irq_desc.irqinfo = new;
723
724 for (i = 0; i < num_infos; i++)
725 new[i] = template[i];
726 }
727
728 return 0;
729 }
730
bd96801_rdev_intb_irqs(struct platform_device * pdev,struct bd96801_pmic_data * pdata,struct bd96801_irqinfo * iinfo,struct regulator_dev * rdev)731 static int bd96801_rdev_intb_irqs(struct platform_device *pdev,
732 struct bd96801_pmic_data *pdata,
733 struct bd96801_irqinfo *iinfo,
734 struct regulator_dev *rdev)
735 {
736 struct regulator_dev *rdev_arr[1];
737 void *retp;
738 int err = 0;
739 int irq;
740 int err_flags[] = {
741 [BD96801_PROT_OVP] = REGULATOR_ERROR_REGULATION_OUT,
742 [BD96801_PROT_UVP] = REGULATOR_ERROR_UNDER_VOLTAGE,
743 [BD96801_PROT_OCP] = REGULATOR_ERROR_OVER_CURRENT,
744 [BD96801_PROT_TEMP] = REGULATOR_ERROR_OVER_TEMP,
745
746 };
747 int wrn_flags[] = {
748 [BD96801_PROT_OVP] = REGULATOR_ERROR_OVER_VOLTAGE_WARN,
749 [BD96801_PROT_UVP] = REGULATOR_ERROR_UNDER_VOLTAGE_WARN,
750 [BD96801_PROT_OCP] = REGULATOR_ERROR_OVER_CURRENT_WARN,
751 [BD96801_PROT_TEMP] = REGULATOR_ERROR_OVER_TEMP_WARN,
752 };
753
754 /*
755 * Don't install IRQ handler if both error and warning
756 * notifications are explicitly disabled
757 */
758 if (!iinfo->err_cfg && !iinfo->wrn_cfg)
759 return 0;
760
761 if (WARN_ON(iinfo->type >= BD96801_NUM_PROT))
762 return -EINVAL;
763
764 if (iinfo->err_cfg)
765 err = err_flags[iinfo->type];
766 else if (iinfo->wrn_cfg)
767 err = wrn_flags[iinfo->type];
768
769 iinfo->irq_desc.data = pdata;
770 irq = platform_get_irq_byname(pdev, iinfo->irq_name);
771 if (irq < 0)
772 return irq;
773 /* Find notifications for this IRQ (WARN/ERR) */
774
775 rdev_arr[0] = rdev;
776 retp = devm_regulator_irq_helper(&pdev->dev,
777 &iinfo->irq_desc, irq,
778 0, err, NULL, rdev_arr,
779 1);
780 if (IS_ERR(retp))
781 return PTR_ERR(retp);
782
783 return 0;
784 }
785
786
787
bd96801_probe(struct platform_device * pdev)788 static int bd96801_probe(struct platform_device *pdev)
789 {
790 struct regulator_dev *ldo_errs_rdev_arr[BD96801_NUM_LDOS];
791 struct bd96801_regulator_data *rdesc;
792 struct regulator_config config = {};
793 int ldo_errs_arr[BD96801_NUM_LDOS];
794 struct bd96801_pmic_data *pdata;
795 int temp_notif_ldos = 0;
796 struct device *parent;
797 int i, ret;
798 void *retp;
799
800 parent = pdev->dev.parent;
801
802 pdata = devm_kmemdup(&pdev->dev, &bd96801_data, sizeof(bd96801_data),
803 GFP_KERNEL);
804 if (!pdata)
805 return -ENOMEM;
806
807 if (initialize_pmic_data(&pdev->dev, pdata))
808 return -ENOMEM;
809
810 pdata->regmap = dev_get_regmap(parent, NULL);
811 if (!pdata->regmap) {
812 dev_err(&pdev->dev, "No register map found\n");
813 return -ENODEV;
814 }
815
816 rdesc = &pdata->regulator_data[0];
817
818 config.driver_data = pdata;
819 config.regmap = pdata->regmap;
820 config.dev = parent;
821
822 ret = bd96801_walk_regulator_dt(&pdev->dev, pdata->regmap, rdesc,
823 BD96801_NUM_REGULATORS);
824 if (ret)
825 return ret;
826
827 for (i = 0; i < ARRAY_SIZE(pdata->regulator_data); i++) {
828 struct regulator_dev *rdev;
829 struct bd96801_irq_desc *idesc = &rdesc[i].irq_desc;
830 int j;
831
832 rdev = devm_regulator_register(&pdev->dev,
833 &rdesc[i].desc, &config);
834 if (IS_ERR(rdev)) {
835 dev_err(&pdev->dev,
836 "failed to register %s regulator\n",
837 rdesc[i].desc.name);
838 return PTR_ERR(rdev);
839 }
840 /*
841 * LDOs don't have own temperature monitoring. If temperature
842 * notification was requested for this LDO from DT then we will
843 * add the regulator to be notified if central IC temperature
844 * exceeds threshold.
845 */
846 if (rdesc[i].ldo_errs) {
847 ldo_errs_rdev_arr[temp_notif_ldos] = rdev;
848 ldo_errs_arr[temp_notif_ldos] = rdesc[i].ldo_errs;
849 temp_notif_ldos++;
850 }
851
852 /* Register INTB handlers for configured protections */
853 for (j = 0; j < idesc->num_irqs; j++) {
854 ret = bd96801_rdev_intb_irqs(pdev, pdata,
855 &idesc->irqinfo[j], rdev);
856 if (ret)
857 return ret;
858 }
859 }
860 if (temp_notif_ldos) {
861 int irq;
862 struct regulator_irq_desc tw_desc = {
863 .name = "bd96801-core-thermal",
864 .irq_off_ms = 500,
865 .map_event = ldo_map_notif,
866 };
867
868 irq = platform_get_irq_byname(pdev, "bd96801-core-thermal");
869 if (irq < 0)
870 return irq;
871
872 retp = devm_regulator_irq_helper(&pdev->dev, &tw_desc, irq, 0,
873 0, &ldo_errs_arr[0],
874 &ldo_errs_rdev_arr[0],
875 temp_notif_ldos);
876 if (IS_ERR(retp))
877 return PTR_ERR(retp);
878 }
879
880 return 0;
881 }
882
883 static const struct platform_device_id bd96801_pmic_id[] = {
884 { "bd96801-regulator", },
885 { }
886 };
887 MODULE_DEVICE_TABLE(platform, bd96801_pmic_id);
888
889 static struct platform_driver bd96801_regulator = {
890 .driver = {
891 .name = "bd96801-pmic"
892 },
893 .probe = bd96801_probe,
894 .id_table = bd96801_pmic_id,
895 };
896
897 module_platform_driver(bd96801_regulator);
898
899 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
900 MODULE_DESCRIPTION("BD96801 voltage regulator driver");
901 MODULE_LICENSE("GPL");
902