1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // DA9121 Single-channel dual-phase 10A buck converter
4 //
5 // Copyright (C) 2020 Axis Communications AB
6 //
7 // DA9130 Single-channel dual-phase 10A buck converter (Automotive)
8 // DA9217 Single-channel dual-phase 6A buck converter
9 // DA9122 Dual-channel single-phase 5A buck converter
10 // DA9131 Dual-channel single-phase 5A buck converter (Automotive)
11 // DA9220 Dual-channel single-phase 3A buck converter
12 // DA9132 Dual-channel single-phase 3A buck converter (Automotive)
13 //
14 // Copyright (C) 2020 Dialog Semiconductor
15
16 #include <linux/of_device.h>
17 #include <linux/of_gpio.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/regulator/of_regulator.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/module.h>
23 #include <linux/regmap.h>
24 #include <linux/err.h>
25 #include <linux/i2c.h>
26 #include <linux/regulator/da9121.h>
27 #include <linux/interrupt.h>
28 #include <linux/workqueue.h>
29
30 #include "da9121-regulator.h"
31
32 /* Chip data */
33 struct da9121 {
34 struct device *dev;
35 struct delayed_work work;
36 struct da9121_pdata *pdata;
37 struct regmap *regmap;
38 struct regulator_dev *rdev[DA9121_IDX_MAX];
39 unsigned int persistent[2];
40 unsigned int passive_delay;
41 int chip_irq;
42 int variant_id;
43 int subvariant_id;
44 };
45
46 /* Define ranges for different variants, enabling translation to/from
47 * registers. Maximums give scope to allow for transients.
48 */
49 struct da9121_range {
50 int val_min;
51 int val_max;
52 int val_stp;
53 int reg_min;
54 int reg_max;
55 };
56
57 static struct da9121_range da9121_10A_2phase_current = {
58 .val_min = 7000000,
59 .val_max = 20000000,
60 .val_stp = 1000000,
61 .reg_min = 1,
62 .reg_max = 14,
63 };
64
65 static struct da9121_range da9121_6A_2phase_current = {
66 .val_min = 7000000,
67 .val_max = 12000000,
68 .val_stp = 1000000,
69 .reg_min = 1,
70 .reg_max = 6,
71 };
72
73 static struct da9121_range da9121_5A_1phase_current = {
74 .val_min = 3500000,
75 .val_max = 10000000,
76 .val_stp = 500000,
77 .reg_min = 1,
78 .reg_max = 14,
79 };
80
81 static struct da9121_range da9121_3A_1phase_current = {
82 .val_min = 3500000,
83 .val_max = 6000000,
84 .val_stp = 500000,
85 .reg_min = 1,
86 .reg_max = 6,
87 };
88
89 struct da9121_variant_info {
90 int num_bucks;
91 int num_phases;
92 struct da9121_range *current_range;
93 };
94
95 static const struct da9121_variant_info variant_parameters[] = {
96 { 1, 2, &da9121_10A_2phase_current }, //DA9121_TYPE_DA9121_DA9130
97 { 2, 1, &da9121_3A_1phase_current }, //DA9121_TYPE_DA9220_DA9132
98 { 2, 1, &da9121_5A_1phase_current }, //DA9121_TYPE_DA9122_DA9131
99 { 1, 2, &da9121_6A_2phase_current }, //DA9121_TYPE_DA9217
100 };
101
102 struct da9121_field {
103 unsigned int reg;
104 unsigned int msk;
105 };
106
107 static const struct da9121_field da9121_current_field[2] = {
108 { DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
109 { DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
110 };
111
112 static const struct da9121_field da9121_mode_field[2] = {
113 { DA9121_REG_BUCK_BUCK1_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
114 { DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
115 };
116
117 struct status_event_data {
118 int buck_id; /* 0=core, 1/2-buck */
119 int reg_index; /* index for status/event/mask register selection */
120 int status_bit; /* bit masks... */
121 int event_bit;
122 int mask_bit;
123 unsigned long notification; /* Notification for status inception */
124 char *warn; /* if NULL, notify - otherwise dev_warn this string */
125 };
126
127 #define DA9121_STATUS(id, bank, name, notification, warning) \
128 { id, bank, \
129 DA9121_MASK_SYS_STATUS_##bank##_##name, \
130 DA9121_MASK_SYS_EVENT_##bank##_E_##name, \
131 DA9121_MASK_SYS_MASK_##bank##_M_##name, \
132 notification, warning }
133
134 /* For second buck related event bits that are specific to DA9122, DA9220 variants */
135 #define DA9xxx_STATUS(id, bank, name, notification, warning) \
136 { id, bank, \
137 DA9xxx_MASK_SYS_STATUS_##bank##_##name, \
138 DA9xxx_MASK_SYS_EVENT_##bank##_E_##name, \
139 DA9xxx_MASK_SYS_MASK_##bank##_M_##name, \
140 notification, warning }
141
142 /* The status signals that may need servicing, depending on device variant.
143 * After assertion, they persist; so event is notified, the IRQ disabled,
144 * and status polled until clear again and IRQ is reenabled.
145 *
146 * SG/PG1/PG2 should be set when device first powers up and should never
147 * re-occur. When this driver starts, it is expected that these will have
148 * self-cleared for when the IRQs are enabled, so these should never be seen.
149 * If seen, the implication is that the device has reset.
150 *
151 * GPIO0/1/2 are not configured for use by default, so should not be seen.
152 */
153 static const struct status_event_data status_event_handling[] = {
154 DA9xxx_STATUS(0, 0, SG, 0, "Handled E_SG\n"),
155 DA9121_STATUS(0, 0, TEMP_CRIT, (REGULATOR_EVENT_OVER_TEMP|REGULATOR_EVENT_DISABLE), NULL),
156 DA9121_STATUS(0, 0, TEMP_WARN, REGULATOR_EVENT_OVER_TEMP, NULL),
157 DA9121_STATUS(1, 1, PG1, 0, "Handled E_PG1\n"),
158 DA9121_STATUS(1, 1, OV1, REGULATOR_EVENT_REGULATION_OUT, NULL),
159 DA9121_STATUS(1, 1, UV1, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
160 DA9121_STATUS(1, 1, OC1, REGULATOR_EVENT_OVER_CURRENT, NULL),
161 DA9xxx_STATUS(2, 1, PG2, 0, "Handled E_PG2\n"),
162 DA9xxx_STATUS(2, 1, OV2, REGULATOR_EVENT_REGULATION_OUT, NULL),
163 DA9xxx_STATUS(2, 1, UV2, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
164 DA9xxx_STATUS(2, 1, OC2, REGULATOR_EVENT_OVER_CURRENT, NULL),
165 DA9121_STATUS(0, 2, GPIO0, 0, "Handled E_GPIO0\n"),
166 DA9121_STATUS(0, 2, GPIO1, 0, "Handled E_GPIO1\n"),
167 DA9121_STATUS(0, 2, GPIO2, 0, "Handled E_GPIO2\n"),
168 };
169
da9121_get_current_limit(struct regulator_dev * rdev)170 static int da9121_get_current_limit(struct regulator_dev *rdev)
171 {
172 struct da9121 *chip = rdev_get_drvdata(rdev);
173 int id = rdev_get_id(rdev);
174 struct da9121_range *range =
175 variant_parameters[chip->variant_id].current_range;
176 unsigned int val = 0;
177 int ret = 0;
178
179 ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
180 if (ret < 0) {
181 dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
182 goto error;
183 }
184
185 if (val < range->reg_min) {
186 ret = -EACCES;
187 goto error;
188 }
189
190 if (val > range->reg_max) {
191 ret = -EINVAL;
192 goto error;
193 }
194
195 return range->val_min + (range->val_stp * (val - range->reg_min));
196 error:
197 return ret;
198 }
199
da9121_ceiling_selector(struct regulator_dev * rdev,int min,int max,unsigned int * selector)200 static int da9121_ceiling_selector(struct regulator_dev *rdev,
201 int min, int max,
202 unsigned int *selector)
203 {
204 struct da9121 *chip = rdev_get_drvdata(rdev);
205 struct da9121_range *range =
206 variant_parameters[chip->variant_id].current_range;
207 unsigned int level;
208 unsigned int i = 0;
209 unsigned int sel = 0;
210 int ret = 0;
211
212 if (range->val_min > max || range->val_max < min) {
213 dev_err(chip->dev,
214 "Requested current out of regulator capability\n");
215 ret = -EINVAL;
216 goto error;
217 }
218
219 level = range->val_max;
220 for (i = range->reg_max; i >= range->reg_min; i--) {
221 if (level <= max) {
222 sel = i;
223 break;
224 }
225 level -= range->val_stp;
226 }
227
228 if (level < min) {
229 dev_err(chip->dev,
230 "Best match falls below minimum requested current\n");
231 ret = -EINVAL;
232 goto error;
233 }
234
235 *selector = sel;
236 error:
237 return ret;
238 }
239
da9121_set_current_limit(struct regulator_dev * rdev,int min_ua,int max_ua)240 static int da9121_set_current_limit(struct regulator_dev *rdev,
241 int min_ua, int max_ua)
242 {
243 struct da9121 *chip = rdev_get_drvdata(rdev);
244 int id = rdev_get_id(rdev);
245 struct da9121_range *range =
246 variant_parameters[chip->variant_id].current_range;
247 unsigned int sel = 0;
248 int ret = 0;
249
250 if (min_ua < range->val_min ||
251 max_ua > range->val_max) {
252 ret = -EINVAL;
253 goto error;
254 }
255
256 ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
257 if (ret < 0)
258 goto error;
259
260 ret = regmap_update_bits(chip->regmap,
261 da9121_current_field[id].reg,
262 da9121_current_field[id].msk,
263 (unsigned int)sel);
264 if (ret < 0)
265 dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);
266
267 error:
268 return ret;
269 }
270
da9121_map_mode(unsigned int mode)271 static unsigned int da9121_map_mode(unsigned int mode)
272 {
273 switch (mode) {
274 case DA9121_BUCK_MODE_FORCE_PWM:
275 return REGULATOR_MODE_FAST;
276 case DA9121_BUCK_MODE_FORCE_PWM_SHEDDING:
277 return REGULATOR_MODE_NORMAL;
278 case DA9121_BUCK_MODE_AUTO:
279 return REGULATOR_MODE_IDLE;
280 case DA9121_BUCK_MODE_FORCE_PFM:
281 return REGULATOR_MODE_STANDBY;
282 default:
283 return -EINVAL;
284 }
285 }
286
da9121_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)287 static int da9121_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
288 {
289 struct da9121 *chip = rdev_get_drvdata(rdev);
290 int id = rdev_get_id(rdev);
291 unsigned int val;
292
293 switch (mode) {
294 case REGULATOR_MODE_FAST:
295 val = DA9121_BUCK_MODE_FORCE_PWM;
296 break;
297 case REGULATOR_MODE_NORMAL:
298 val = DA9121_BUCK_MODE_FORCE_PWM_SHEDDING;
299 break;
300 case REGULATOR_MODE_IDLE:
301 val = DA9121_BUCK_MODE_AUTO;
302 break;
303 case REGULATOR_MODE_STANDBY:
304 val = DA9121_BUCK_MODE_FORCE_PFM;
305 break;
306 default:
307 return -EINVAL;
308 }
309
310 return regmap_update_bits(chip->regmap,
311 da9121_mode_field[id].reg,
312 da9121_mode_field[id].msk,
313 val);
314 }
315
da9121_buck_get_mode(struct regulator_dev * rdev)316 static unsigned int da9121_buck_get_mode(struct regulator_dev *rdev)
317 {
318 struct da9121 *chip = rdev_get_drvdata(rdev);
319 int id = rdev_get_id(rdev);
320 unsigned int val;
321 int ret = 0;
322
323 ret = regmap_read(chip->regmap, da9121_mode_field[id].reg, &val);
324 if (ret < 0) {
325 dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
326 return -EINVAL;
327 }
328
329 return da9121_map_mode(val & da9121_mode_field[id].msk);
330 }
331
332 static const struct regulator_ops da9121_buck_ops = {
333 .enable = regulator_enable_regmap,
334 .disable = regulator_disable_regmap,
335 .is_enabled = regulator_is_enabled_regmap,
336 .set_voltage_sel = regulator_set_voltage_sel_regmap,
337 .get_voltage_sel = regulator_get_voltage_sel_regmap,
338 .list_voltage = regulator_list_voltage_linear,
339 .get_current_limit = da9121_get_current_limit,
340 .set_current_limit = da9121_set_current_limit,
341 .set_mode = da9121_buck_set_mode,
342 .get_mode = da9121_buck_get_mode,
343 };
344
345 static struct of_regulator_match da9121_matches[] = {
346 [DA9121_IDX_BUCK1] = { .name = "buck1" },
347 [DA9121_IDX_BUCK2] = { .name = "buck2" },
348 };
349
da9121_of_parse_cb(struct device_node * np,const struct regulator_desc * desc,struct regulator_config * config)350 static int da9121_of_parse_cb(struct device_node *np,
351 const struct regulator_desc *desc,
352 struct regulator_config *config)
353 {
354 struct da9121 *chip = config->driver_data;
355 struct da9121_pdata *pdata;
356 struct gpio_desc *ena_gpiod;
357
358 if (chip->pdata == NULL) {
359 pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
360 if (!pdata)
361 return -ENOMEM;
362 } else {
363 pdata = chip->pdata;
364 }
365
366 pdata->num_buck++;
367
368 if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
369 dev_err(chip->dev, "Error: excessive regulators for device\n");
370 return -ENODEV;
371 }
372
373 ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
374 GPIOD_OUT_HIGH |
375 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
376 "da9121-enable");
377 if (!IS_ERR(ena_gpiod))
378 config->ena_gpiod = ena_gpiod;
379
380 if (variant_parameters[chip->variant_id].num_bucks == 2) {
381 uint32_t ripple_cancel;
382 uint32_t ripple_reg;
383 int ret;
384
385 if (of_property_read_u32(da9121_matches[pdata->num_buck-1].of_node,
386 "dlg,ripple-cancel", &ripple_cancel)) {
387 if (pdata->num_buck > 1)
388 ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
389 else
390 ripple_reg = DA9121_REG_BUCK_BUCK1_7;
391
392 ret = regmap_update_bits(chip->regmap, ripple_reg,
393 DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
394 ripple_cancel);
395 if (ret < 0)
396 dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
397 }
398 }
399
400 return 0;
401 }
402
403 #define DA9121_MIN_MV 300
404 #define DA9121_MAX_MV 1900
405 #define DA9121_STEP_MV 10
406 #define DA9121_MIN_SEL (DA9121_MIN_MV / DA9121_STEP_MV)
407 #define DA9121_N_VOLTAGES (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
408 + 1 + DA9121_MIN_SEL)
409
410 static const struct regulator_desc da9121_reg = {
411 .id = DA9121_IDX_BUCK1,
412 .name = "da9121",
413 .of_match = "buck1",
414 .of_parse_cb = da9121_of_parse_cb,
415 .owner = THIS_MODULE,
416 .regulators_node = of_match_ptr("regulators"),
417 .of_map_mode = da9121_map_mode,
418 .ops = &da9121_buck_ops,
419 .type = REGULATOR_VOLTAGE,
420 .n_voltages = DA9121_N_VOLTAGES,
421 .min_uV = DA9121_MIN_MV * 1000,
422 .uV_step = DA9121_STEP_MV * 1000,
423 .linear_min_sel = DA9121_MIN_SEL,
424 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
425 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
426 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
427 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
428 /* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
429 .ramp_delay = 20000,
430 /* tBUCK_EN */
431 .enable_time = 20,
432 };
433
434 static const struct regulator_desc da9220_reg[2] = {
435 {
436 .id = DA9121_IDX_BUCK1,
437 .name = "DA9220/DA9132 BUCK1",
438 .of_match = "buck1",
439 .of_parse_cb = da9121_of_parse_cb,
440 .owner = THIS_MODULE,
441 .regulators_node = of_match_ptr("regulators"),
442 .of_map_mode = da9121_map_mode,
443 .ops = &da9121_buck_ops,
444 .type = REGULATOR_VOLTAGE,
445 .n_voltages = DA9121_N_VOLTAGES,
446 .min_uV = DA9121_MIN_MV * 1000,
447 .uV_step = DA9121_STEP_MV * 1000,
448 .linear_min_sel = DA9121_MIN_SEL,
449 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
450 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
451 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
452 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
453 },
454 {
455 .id = DA9121_IDX_BUCK2,
456 .name = "DA9220/DA9132 BUCK2",
457 .of_match = "buck2",
458 .of_parse_cb = da9121_of_parse_cb,
459 .owner = THIS_MODULE,
460 .regulators_node = of_match_ptr("regulators"),
461 .of_map_mode = da9121_map_mode,
462 .ops = &da9121_buck_ops,
463 .type = REGULATOR_VOLTAGE,
464 .n_voltages = DA9121_N_VOLTAGES,
465 .min_uV = DA9121_MIN_MV * 1000,
466 .uV_step = DA9121_STEP_MV * 1000,
467 .linear_min_sel = DA9121_MIN_SEL,
468 .enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
469 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
470 .vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
471 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
472 }
473 };
474
475 static const struct regulator_desc da9122_reg[2] = {
476 {
477 .id = DA9121_IDX_BUCK1,
478 .name = "DA9122/DA9131 BUCK1",
479 .of_match = "buck1",
480 .of_parse_cb = da9121_of_parse_cb,
481 .owner = THIS_MODULE,
482 .regulators_node = of_match_ptr("regulators"),
483 .of_map_mode = da9121_map_mode,
484 .ops = &da9121_buck_ops,
485 .type = REGULATOR_VOLTAGE,
486 .n_voltages = DA9121_N_VOLTAGES,
487 .min_uV = DA9121_MIN_MV * 1000,
488 .uV_step = DA9121_STEP_MV * 1000,
489 .linear_min_sel = DA9121_MIN_SEL,
490 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
491 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
492 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
493 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
494 },
495 {
496 .id = DA9121_IDX_BUCK2,
497 .name = "DA9122/DA9131 BUCK2",
498 .of_match = "buck2",
499 .of_parse_cb = da9121_of_parse_cb,
500 .owner = THIS_MODULE,
501 .regulators_node = of_match_ptr("regulators"),
502 .of_map_mode = da9121_map_mode,
503 .ops = &da9121_buck_ops,
504 .type = REGULATOR_VOLTAGE,
505 .n_voltages = DA9121_N_VOLTAGES,
506 .min_uV = DA9121_MIN_MV * 1000,
507 .uV_step = DA9121_STEP_MV * 1000,
508 .linear_min_sel = DA9121_MIN_SEL,
509 .enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
510 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
511 .vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
512 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
513 }
514 };
515
516 static const struct regulator_desc da9217_reg = {
517 .id = DA9121_IDX_BUCK1,
518 .name = "DA9217 BUCK1",
519 .of_match = "buck1",
520 .of_parse_cb = da9121_of_parse_cb,
521 .owner = THIS_MODULE,
522 .regulators_node = of_match_ptr("regulators"),
523 .of_map_mode = da9121_map_mode,
524 .ops = &da9121_buck_ops,
525 .type = REGULATOR_VOLTAGE,
526 .n_voltages = DA9121_N_VOLTAGES,
527 .min_uV = DA9121_MIN_MV * 1000,
528 .uV_step = DA9121_STEP_MV * 1000,
529 .linear_min_sel = DA9121_MIN_SEL,
530 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
531 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
532 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
533 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
534 };
535
536 static const struct regulator_desc *local_da9121_regulators[][DA9121_IDX_MAX] = {
537 [DA9121_TYPE_DA9121_DA9130] = { &da9121_reg, NULL },
538 [DA9121_TYPE_DA9220_DA9132] = { &da9220_reg[0], &da9220_reg[1] },
539 [DA9121_TYPE_DA9122_DA9131] = { &da9122_reg[0], &da9122_reg[1] },
540 [DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
541 };
542
da9121_status_poll_on(struct work_struct * work)543 static void da9121_status_poll_on(struct work_struct *work)
544 {
545 struct da9121 *chip = container_of(work, struct da9121, work.work);
546 int status[3] = {0};
547 int clear[3] = {0};
548 unsigned long delay;
549 int i;
550 int ret;
551
552 ret = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_STATUS_0, status, 2);
553 if (ret < 0) {
554 dev_err(chip->dev,
555 "Failed to read STATUS registers: %d\n", ret);
556 goto error;
557 }
558
559 /* Possible events are tested to be within range for the variant, potentially
560 * masked by the IRQ handler (not just warned about), as having been masked,
561 * and the respective state cleared - then flagged to unmask for next IRQ.
562 */
563 for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
564 const struct status_event_data *item = &status_event_handling[i];
565 int reg_idx = item->reg_index;
566 bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
567 bool supported = (item->warn == NULL);
568 bool persisting = (chip->persistent[reg_idx] & item->event_bit);
569 bool now_cleared = !(status[reg_idx] & item->status_bit);
570
571 if (relevant && supported && persisting && now_cleared) {
572 clear[reg_idx] |= item->mask_bit;
573 chip->persistent[reg_idx] &= ~item->event_bit;
574 }
575 }
576
577 for (i = 0; i < 2; i++) {
578 if (clear[i]) {
579 unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
580 unsigned int mbit = clear[i];
581
582 ret = regmap_update_bits(chip->regmap, reg, mbit, 0);
583 if (ret < 0) {
584 dev_err(chip->dev,
585 "Failed to unmask 0x%02x %d\n",
586 reg, ret);
587 goto error;
588 }
589 }
590 }
591
592 if (chip->persistent[0] | chip->persistent[1]) {
593 delay = msecs_to_jiffies(chip->passive_delay);
594 queue_delayed_work(system_freezable_wq, &chip->work, delay);
595 }
596
597 error:
598 return;
599 }
600
da9121_irq_handler(int irq,void * data)601 static irqreturn_t da9121_irq_handler(int irq, void *data)
602 {
603 struct da9121 *chip = data;
604 struct regulator_dev *rdev;
605 int event[3] = {0};
606 int handled[3] = {0};
607 int mask[3] = {0};
608 int ret = IRQ_NONE;
609 int i;
610 int err;
611
612 err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_EVENT_0, event, 3);
613 if (err < 0) {
614 dev_err(chip->dev, "Failed to read EVENT registers %d\n", err);
615 ret = IRQ_NONE;
616 goto error;
617 }
618
619 err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_MASK_0, mask, 3);
620 if (err < 0) {
621 dev_err(chip->dev,
622 "Failed to read MASK registers: %d\n", ret);
623 ret = IRQ_NONE;
624 goto error;
625 }
626
627 rdev = chip->rdev[DA9121_IDX_BUCK1];
628
629 /* Possible events are tested to be within range for the variant, currently
630 * enabled, and having triggered this IRQ. The event may then be notified,
631 * or a warning given for unexpected events - those from device POR, and
632 * currently unsupported GPIO configurations.
633 */
634 for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
635 const struct status_event_data *item = &status_event_handling[i];
636 int reg_idx = item->reg_index;
637 bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
638 bool enabled = !(mask[reg_idx] & item->mask_bit);
639 bool active = (event[reg_idx] & item->event_bit);
640 bool notify = (item->warn == NULL);
641
642 if (relevant && enabled && active) {
643 if (notify) {
644 chip->persistent[reg_idx] |= item->event_bit;
645 regulator_notifier_call_chain(rdev, item->notification, NULL);
646 } else {
647 dev_warn(chip->dev, item->warn);
648 handled[reg_idx] |= item->event_bit;
649 ret = IRQ_HANDLED;
650 }
651 }
652 }
653
654 for (i = 0; i < 3; i++) {
655 if (event[i] != handled[i]) {
656 dev_warn(chip->dev,
657 "Unhandled event(s) in bank%d 0x%02x\n", i,
658 event[i] ^ handled[i]);
659 }
660 }
661
662 /* Mask the interrupts for persistent events OV, OC, UV, WARN, CRIT */
663 for (i = 0; i < 2; i++) {
664 if (handled[i]) {
665 unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
666 unsigned int mbit = handled[i];
667
668 err = regmap_update_bits(chip->regmap, reg, mbit, mbit);
669 if (err < 0) {
670 dev_err(chip->dev,
671 "Failed to mask 0x%02x interrupt %d\n",
672 reg, err);
673 ret = IRQ_NONE;
674 goto error;
675 }
676 }
677 }
678
679 /* clear the events */
680 if (handled[0] | handled[1] | handled[2]) {
681 err = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_EVENT_0, handled, 3);
682 if (err < 0) {
683 dev_err(chip->dev, "Fail to write EVENTs %d\n", err);
684 ret = IRQ_NONE;
685 goto error;
686 }
687 }
688
689 queue_delayed_work(system_freezable_wq, &chip->work, 0);
690 error:
691 return ret;
692 }
693
da9121_set_regulator_config(struct da9121 * chip)694 static int da9121_set_regulator_config(struct da9121 *chip)
695 {
696 struct regulator_config config = { };
697 unsigned int max_matches = variant_parameters[chip->variant_id].num_bucks;
698 int ret = 0;
699 int i;
700
701 for (i = 0; i < max_matches; i++) {
702 const struct regulator_desc *regl_desc =
703 local_da9121_regulators[chip->variant_id][i];
704
705 config.dev = chip->dev;
706 config.driver_data = chip;
707 config.regmap = chip->regmap;
708
709 chip->rdev[i] = devm_regulator_register(chip->dev,
710 regl_desc, &config);
711 if (IS_ERR(chip->rdev[i])) {
712 dev_err(chip->dev, "Failed to register regulator %s, %d/%d\n",
713 regl_desc->name, (i+1), max_matches);
714 ret = PTR_ERR(chip->rdev[i]);
715 goto error;
716 }
717 }
718
719 error:
720 return ret;
721 }
722
723 /* DA9121 chip register model */
724 static const struct regmap_range da9121_1ch_readable_ranges[] = {
725 regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
726 regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
727 regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
728 regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
729 regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
730 };
731
732 static const struct regmap_access_table da9121_1ch_readable_table = {
733 .yes_ranges = da9121_1ch_readable_ranges,
734 .n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
735 };
736
737 static const struct regmap_range da9121_2ch_readable_ranges[] = {
738 regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
739 regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
740 regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
741 regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
742 regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
743 regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
744 };
745
746 static const struct regmap_access_table da9121_2ch_readable_table = {
747 .yes_ranges = da9121_2ch_readable_ranges,
748 .n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
749 };
750
751 static const struct regmap_range da9121_1ch_writeable_ranges[] = {
752 regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
753 regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
754 regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
755 regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
756 regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
757 };
758
759 static const struct regmap_access_table da9121_1ch_writeable_table = {
760 .yes_ranges = da9121_1ch_writeable_ranges,
761 .n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
762 };
763
764 static const struct regmap_range da9121_2ch_writeable_ranges[] = {
765 regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
766 regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
767 regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
768 regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
769 regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
770 regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
771 regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
772 };
773
774 static const struct regmap_access_table da9121_2ch_writeable_table = {
775 .yes_ranges = da9121_2ch_writeable_ranges,
776 .n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
777 };
778
779
780 static const struct regmap_range da9121_volatile_ranges[] = {
781 regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
782 regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
783 regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
784 };
785
786 static const struct regmap_access_table da9121_volatile_table = {
787 .yes_ranges = da9121_volatile_ranges,
788 .n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
789 };
790
791 /* DA9121 regmap config for 1 channel variants */
792 static struct regmap_config da9121_1ch_regmap_config = {
793 .reg_bits = 8,
794 .val_bits = 8,
795 .max_register = DA9121_REG_OTP_CONFIG_ID,
796 .rd_table = &da9121_1ch_readable_table,
797 .wr_table = &da9121_1ch_writeable_table,
798 .volatile_table = &da9121_volatile_table,
799 .cache_type = REGCACHE_RBTREE,
800 };
801
802 /* DA9121 regmap config for 2 channel variants */
803 static struct regmap_config da9121_2ch_regmap_config = {
804 .reg_bits = 8,
805 .val_bits = 8,
806 .max_register = DA9121_REG_OTP_CONFIG_ID,
807 .rd_table = &da9121_2ch_readable_table,
808 .wr_table = &da9121_2ch_writeable_table,
809 .volatile_table = &da9121_volatile_table,
810 .cache_type = REGCACHE_RBTREE,
811 };
812
da9121_check_device_type(struct i2c_client * i2c,struct da9121 * chip)813 static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
814 {
815 u32 device_id;
816 u32 variant_id;
817 u8 variant_mrc, variant_vrc;
818 char *type;
819 bool config_match = false;
820 int ret = 0;
821
822 ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
823 if (ret < 0) {
824 dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
825 goto error;
826 }
827
828 ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
829 if (ret < 0) {
830 dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
831 goto error;
832 }
833
834 if (device_id != DA9121_DEVICE_ID) {
835 dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
836 ret = -ENODEV;
837 goto error;
838 }
839
840 variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;
841
842 switch (chip->subvariant_id) {
843 case DA9121_SUBTYPE_DA9121:
844 type = "DA9121";
845 config_match = (variant_vrc == DA9121_VARIANT_VRC);
846 break;
847 case DA9121_SUBTYPE_DA9130:
848 type = "DA9130";
849 config_match = (variant_vrc == DA9130_VARIANT_VRC);
850 break;
851 case DA9121_SUBTYPE_DA9220:
852 type = "DA9220";
853 config_match = (variant_vrc == DA9220_VARIANT_VRC);
854 break;
855 case DA9121_SUBTYPE_DA9132:
856 type = "DA9132";
857 config_match = (variant_vrc == DA9132_VARIANT_VRC);
858 break;
859 case DA9121_SUBTYPE_DA9122:
860 type = "DA9122";
861 config_match = (variant_vrc == DA9122_VARIANT_VRC);
862 break;
863 case DA9121_SUBTYPE_DA9131:
864 type = "DA9131";
865 config_match = (variant_vrc == DA9131_VARIANT_VRC);
866 break;
867 case DA9121_SUBTYPE_DA9217:
868 type = "DA9217";
869 config_match = (variant_vrc == DA9217_VARIANT_VRC);
870 break;
871 default:
872 type = "Unknown";
873 break;
874 }
875
876 dev_info(chip->dev,
877 "Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
878 device_id, variant_id, type);
879
880 if (!config_match) {
881 dev_err(chip->dev, "Device tree configuration does not match detected device.\n");
882 ret = -EINVAL;
883 goto error;
884 }
885
886 variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
887 >> DA9121_SHIFT_OTP_VARIANT_ID_MRC;
888
889 if ((device_id == DA9121_DEVICE_ID) &&
890 (variant_mrc < DA9121_VARIANT_MRC_BASE)) {
891 dev_err(chip->dev,
892 "Cannot support variant MRC: 0x%02X\n", variant_mrc);
893 ret = -EINVAL;
894 }
895 error:
896 return ret;
897 }
898
da9121_assign_chip_model(struct i2c_client * i2c,struct da9121 * chip)899 static int da9121_assign_chip_model(struct i2c_client *i2c,
900 struct da9121 *chip)
901 {
902 struct regmap_config *regmap;
903 int ret = 0;
904
905 chip->dev = &i2c->dev;
906
907 /* Use configured subtype to select the regulator descriptor index and
908 * register map, common to both consumer and automotive grade variants
909 */
910 switch (chip->subvariant_id) {
911 case DA9121_SUBTYPE_DA9121:
912 case DA9121_SUBTYPE_DA9130:
913 chip->variant_id = DA9121_TYPE_DA9121_DA9130;
914 regmap = &da9121_1ch_regmap_config;
915 break;
916 case DA9121_SUBTYPE_DA9217:
917 chip->variant_id = DA9121_TYPE_DA9217;
918 regmap = &da9121_1ch_regmap_config;
919 break;
920 case DA9121_SUBTYPE_DA9122:
921 case DA9121_SUBTYPE_DA9131:
922 chip->variant_id = DA9121_TYPE_DA9122_DA9131;
923 regmap = &da9121_2ch_regmap_config;
924 break;
925 case DA9121_SUBTYPE_DA9220:
926 case DA9121_SUBTYPE_DA9132:
927 chip->variant_id = DA9121_TYPE_DA9220_DA9132;
928 regmap = &da9121_2ch_regmap_config;
929 break;
930 }
931
932 /* Set these up for of_regulator_match call which may want .of_map_modes */
933 da9121_matches[0].desc = local_da9121_regulators[chip->variant_id][0];
934 da9121_matches[1].desc = local_da9121_regulators[chip->variant_id][1];
935
936 chip->regmap = devm_regmap_init_i2c(i2c, regmap);
937 if (IS_ERR(chip->regmap)) {
938 ret = PTR_ERR(chip->regmap);
939 dev_err(chip->dev, "Failed to configure a register map: %d\n",
940 ret);
941 return ret;
942 }
943
944 ret = da9121_check_device_type(i2c, chip);
945
946 return ret;
947 }
948
da9121_config_irq(struct i2c_client * i2c,struct da9121 * chip)949 static int da9121_config_irq(struct i2c_client *i2c,
950 struct da9121 *chip)
951 {
952 unsigned int p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
953 const int mask_all[4] = { 0, 0, 0xFF, 0xFF };
954 int ret = 0;
955
956 chip->chip_irq = i2c->irq;
957
958 if (chip->chip_irq != 0) {
959 if (!of_property_read_u32(chip->dev->of_node,
960 "dlg,irq-polling-delay-passive-ms",
961 &p_delay)) {
962 if (p_delay < DA9121_MIN_POLLING_PERIOD_MS ||
963 p_delay > DA9121_MAX_POLLING_PERIOD_MS) {
964 dev_warn(chip->dev,
965 "Out-of-range polling period %d ms\n",
966 p_delay);
967 p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
968 }
969 }
970
971 chip->passive_delay = p_delay;
972
973 ret = request_threaded_irq(chip->chip_irq, NULL,
974 da9121_irq_handler,
975 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
976 "da9121", chip);
977 if (ret != 0) {
978 dev_err(chip->dev, "Failed IRQ request: %d\n",
979 chip->chip_irq);
980 goto error;
981 }
982
983 ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
984 if (ret != 0) {
985 dev_err(chip->dev, "Failed to set IRQ masks: %d\n",
986 ret);
987 goto regmap_error;
988 }
989
990 INIT_DELAYED_WORK(&chip->work, da9121_status_poll_on);
991 dev_info(chip->dev, "Interrupt polling period set at %d ms\n",
992 chip->passive_delay);
993 }
994 error:
995 return ret;
996 regmap_error:
997 free_irq(chip->chip_irq, chip);
998 return ret;
999 }
1000
1001 static const struct of_device_id da9121_dt_ids[] = {
1002 { .compatible = "dlg,da9121", .data = (void *) DA9121_SUBTYPE_DA9121 },
1003 { .compatible = "dlg,da9130", .data = (void *) DA9121_SUBTYPE_DA9130 },
1004 { .compatible = "dlg,da9217", .data = (void *) DA9121_SUBTYPE_DA9217 },
1005 { .compatible = "dlg,da9122", .data = (void *) DA9121_SUBTYPE_DA9122 },
1006 { .compatible = "dlg,da9131", .data = (void *) DA9121_SUBTYPE_DA9131 },
1007 { .compatible = "dlg,da9220", .data = (void *) DA9121_SUBTYPE_DA9220 },
1008 { .compatible = "dlg,da9132", .data = (void *) DA9121_SUBTYPE_DA9132 },
1009 { }
1010 };
1011 MODULE_DEVICE_TABLE(of, da9121_dt_ids);
1012
da9121_of_get_id(struct device * dev)1013 static inline int da9121_of_get_id(struct device *dev)
1014 {
1015 const struct of_device_id *id = of_match_device(da9121_dt_ids, dev);
1016
1017 if (!id) {
1018 dev_err(dev, "%s: Failed\n", __func__);
1019 return -EINVAL;
1020 }
1021 return (uintptr_t)id->data;
1022 }
1023
da9121_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)1024 static int da9121_i2c_probe(struct i2c_client *i2c,
1025 const struct i2c_device_id *id)
1026 {
1027 struct da9121 *chip;
1028 const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1029 int ret = 0;
1030
1031 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
1032 if (!chip) {
1033 ret = -ENOMEM;
1034 goto error;
1035 }
1036
1037 chip->pdata = i2c->dev.platform_data;
1038 chip->subvariant_id = da9121_of_get_id(&i2c->dev);
1039
1040 ret = da9121_assign_chip_model(i2c, chip);
1041 if (ret < 0)
1042 goto error;
1043
1044 ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1045 if (ret != 0) {
1046 dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1047 goto error;
1048 }
1049
1050 ret = da9121_set_regulator_config(chip);
1051 if (ret < 0)
1052 goto error;
1053
1054 ret = da9121_config_irq(i2c, chip);
1055
1056 error:
1057 return ret;
1058 }
1059
da9121_i2c_remove(struct i2c_client * i2c)1060 static int da9121_i2c_remove(struct i2c_client *i2c)
1061 {
1062 struct da9121 *chip = i2c_get_clientdata(i2c);
1063 const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1064 int ret = 0;
1065
1066 free_irq(chip->chip_irq, chip);
1067 cancel_delayed_work_sync(&chip->work);
1068
1069 ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1070 if (ret != 0)
1071 dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1072 return ret;
1073 }
1074
1075 static const struct i2c_device_id da9121_i2c_id[] = {
1076 {"da9121", DA9121_TYPE_DA9121_DA9130},
1077 {"da9130", DA9121_TYPE_DA9121_DA9130},
1078 {"da9217", DA9121_TYPE_DA9217},
1079 {"da9122", DA9121_TYPE_DA9122_DA9131},
1080 {"da9131", DA9121_TYPE_DA9122_DA9131},
1081 {"da9220", DA9121_TYPE_DA9220_DA9132},
1082 {"da9132", DA9121_TYPE_DA9220_DA9132},
1083 {},
1084 };
1085 MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
1086
1087 static struct i2c_driver da9121_regulator_driver = {
1088 .driver = {
1089 .name = "da9121",
1090 .of_match_table = of_match_ptr(da9121_dt_ids),
1091 },
1092 .probe = da9121_i2c_probe,
1093 .remove = da9121_i2c_remove,
1094 .id_table = da9121_i2c_id,
1095 };
1096
1097 module_i2c_driver(da9121_regulator_driver);
1098
1099 MODULE_LICENSE("GPL v2");
1100