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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI LP8788 MFD - buck regulator driver
4 *
5 * Copyright 2012 Texas Instruments
6 *
7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
8 */
9
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/err.h>
13#include <linux/platform_device.h>
14#include <linux/regulator/driver.h>
15#include <linux/mfd/lp8788.h>
16#include <linux/gpio.h>
17
18/* register address */
19#define LP8788_EN_BUCK 0x0C
20#define LP8788_BUCK_DVS_SEL 0x1D
21#define LP8788_BUCK1_VOUT0 0x1E
22#define LP8788_BUCK1_VOUT1 0x1F
23#define LP8788_BUCK1_VOUT2 0x20
24#define LP8788_BUCK1_VOUT3 0x21
25#define LP8788_BUCK2_VOUT0 0x22
26#define LP8788_BUCK2_VOUT1 0x23
27#define LP8788_BUCK2_VOUT2 0x24
28#define LP8788_BUCK2_VOUT3 0x25
29#define LP8788_BUCK3_VOUT 0x26
30#define LP8788_BUCK4_VOUT 0x27
31#define LP8788_BUCK1_TIMESTEP 0x28
32#define LP8788_BUCK_PWM 0x2D
33
34/* mask/shift bits */
35#define LP8788_EN_BUCK1_M BIT(0) /* Addr 0Ch */
36#define LP8788_EN_BUCK2_M BIT(1)
37#define LP8788_EN_BUCK3_M BIT(2)
38#define LP8788_EN_BUCK4_M BIT(3)
39#define LP8788_BUCK1_DVS_SEL_M 0x04 /* Addr 1Dh */
40#define LP8788_BUCK1_DVS_M 0x03
41#define LP8788_BUCK1_DVS_S 0
42#define LP8788_BUCK2_DVS_SEL_M 0x40
43#define LP8788_BUCK2_DVS_M 0x30
44#define LP8788_BUCK2_DVS_S 4
45#define LP8788_BUCK1_DVS_I2C BIT(2)
46#define LP8788_BUCK2_DVS_I2C BIT(6)
47#define LP8788_BUCK1_DVS_PIN (0 << 2)
48#define LP8788_BUCK2_DVS_PIN (0 << 6)
49#define LP8788_VOUT_M 0x1F /* Addr 1Eh ~ 27h */
50#define LP8788_STARTUP_TIME_M 0xF8 /* Addr 28h ~ 2Bh */
51#define LP8788_STARTUP_TIME_S 3
52#define LP8788_FPWM_BUCK1_M BIT(0) /* Addr 2Dh */
53#define LP8788_FPWM_BUCK1_S 0
54#define LP8788_FPWM_BUCK2_M BIT(1)
55#define LP8788_FPWM_BUCK2_S 1
56#define LP8788_FPWM_BUCK3_M BIT(2)
57#define LP8788_FPWM_BUCK3_S 2
58#define LP8788_FPWM_BUCK4_M BIT(3)
59#define LP8788_FPWM_BUCK4_S 3
60
61#define INVALID_ADDR 0xFF
62#define LP8788_FORCE_PWM 1
63#define LP8788_AUTO_PWM 0
64#define PIN_LOW 0
65#define PIN_HIGH 1
66#define ENABLE_TIME_USEC 32
67
68#define BUCK_FPWM_MASK(x) (1 << (x))
69#define BUCK_FPWM_SHIFT(x) (x)
70
71enum lp8788_dvs_state {
72 DVS_LOW = GPIOF_OUT_INIT_LOW,
73 DVS_HIGH = GPIOF_OUT_INIT_HIGH,
74};
75
76enum lp8788_dvs_mode {
77 REGISTER,
78 EXTPIN,
79};
80
81enum lp8788_buck_id {
82 BUCK1,
83 BUCK2,
84 BUCK3,
85 BUCK4,
86};
87
88struct lp8788_buck {
89 struct lp8788 *lp;
90 struct regulator_dev *regulator;
91 void *dvs;
92};
93
94/* BUCK 1 ~ 4 voltage ranges */
95static const struct linear_range buck_volt_ranges[] = {
96 REGULATOR_LINEAR_RANGE(500000, 0, 0, 0),
97 REGULATOR_LINEAR_RANGE(800000, 1, 25, 50000),
98};
99
100static void lp8788_buck1_set_dvs(struct lp8788_buck *buck)
101{
102 struct lp8788_buck1_dvs *dvs = (struct lp8788_buck1_dvs *)buck->dvs;
103 enum lp8788_dvs_state pinstate;
104
105 if (!dvs)
106 return;
107
108 pinstate = dvs->vsel == DVS_SEL_V0 ? DVS_LOW : DVS_HIGH;
109 if (gpio_is_valid(dvs->gpio))
110 gpio_set_value(dvs->gpio, pinstate);
111}
112
113static void lp8788_buck2_set_dvs(struct lp8788_buck *buck)
114{
115 struct lp8788_buck2_dvs *dvs = (struct lp8788_buck2_dvs *)buck->dvs;
116 enum lp8788_dvs_state pin1, pin2;
117
118 if (!dvs)
119 return;
120
121 switch (dvs->vsel) {
122 case DVS_SEL_V0:
123 pin1 = DVS_LOW;
124 pin2 = DVS_LOW;
125 break;
126 case DVS_SEL_V1:
127 pin1 = DVS_HIGH;
128 pin2 = DVS_LOW;
129 break;
130 case DVS_SEL_V2:
131 pin1 = DVS_LOW;
132 pin2 = DVS_HIGH;
133 break;
134 case DVS_SEL_V3:
135 pin1 = DVS_HIGH;
136 pin2 = DVS_HIGH;
137 break;
138 default:
139 return;
140 }
141
142 if (gpio_is_valid(dvs->gpio[0]))
143 gpio_set_value(dvs->gpio[0], pin1);
144
145 if (gpio_is_valid(dvs->gpio[1]))
146 gpio_set_value(dvs->gpio[1], pin2);
147}
148
149static void lp8788_set_dvs(struct lp8788_buck *buck, enum lp8788_buck_id id)
150{
151 switch (id) {
152 case BUCK1:
153 lp8788_buck1_set_dvs(buck);
154 break;
155 case BUCK2:
156 lp8788_buck2_set_dvs(buck);
157 break;
158 default:
159 break;
160 }
161}
162
163static enum lp8788_dvs_mode
164lp8788_get_buck_dvs_ctrl_mode(struct lp8788_buck *buck, enum lp8788_buck_id id)
165{
166 u8 val, mask;
167
168 switch (id) {
169 case BUCK1:
170 mask = LP8788_BUCK1_DVS_SEL_M;
171 break;
172 case BUCK2:
173 mask = LP8788_BUCK2_DVS_SEL_M;
174 break;
175 default:
176 return REGISTER;
177 }
178
179 lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
180
181 return val & mask ? REGISTER : EXTPIN;
182}
183
184static bool lp8788_is_valid_buck_addr(u8 addr)
185{
186 switch (addr) {
187 case LP8788_BUCK1_VOUT0:
188 case LP8788_BUCK1_VOUT1:
189 case LP8788_BUCK1_VOUT2:
190 case LP8788_BUCK1_VOUT3:
191 case LP8788_BUCK2_VOUT0:
192 case LP8788_BUCK2_VOUT1:
193 case LP8788_BUCK2_VOUT2:
194 case LP8788_BUCK2_VOUT3:
195 return true;
196 default:
197 return false;
198 }
199}
200
201static u8 lp8788_select_buck_vout_addr(struct lp8788_buck *buck,
202 enum lp8788_buck_id id)
203{
204 enum lp8788_dvs_mode mode = lp8788_get_buck_dvs_ctrl_mode(buck, id);
205 struct lp8788_buck1_dvs *b1_dvs;
206 struct lp8788_buck2_dvs *b2_dvs;
207 u8 val, idx, addr;
208 int pin1, pin2;
209
210 switch (id) {
211 case BUCK1:
212 if (mode == EXTPIN) {
213 b1_dvs = (struct lp8788_buck1_dvs *)buck->dvs;
214 if (!b1_dvs)
215 goto err;
216
217 idx = gpio_get_value(b1_dvs->gpio) ? 1 : 0;
218 } else {
219 lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
220 idx = (val & LP8788_BUCK1_DVS_M) >> LP8788_BUCK1_DVS_S;
221 }
222 addr = LP8788_BUCK1_VOUT0 + idx;
223 break;
224 case BUCK2:
225 if (mode == EXTPIN) {
226 b2_dvs = (struct lp8788_buck2_dvs *)buck->dvs;
227 if (!b2_dvs)
228 goto err;
229
230 pin1 = gpio_get_value(b2_dvs->gpio[0]);
231 pin2 = gpio_get_value(b2_dvs->gpio[1]);
232
233 if (pin1 == PIN_LOW && pin2 == PIN_LOW)
234 idx = 0;
235 else if (pin1 == PIN_LOW && pin2 == PIN_HIGH)
236 idx = 2;
237 else if (pin1 == PIN_HIGH && pin2 == PIN_LOW)
238 idx = 1;
239 else
240 idx = 3;
241 } else {
242 lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
243 idx = (val & LP8788_BUCK2_DVS_M) >> LP8788_BUCK2_DVS_S;
244 }
245 addr = LP8788_BUCK2_VOUT0 + idx;
246 break;
247 default:
248 goto err;
249 }
250
251 return addr;
252err:
253 return INVALID_ADDR;
254}
255
256static int lp8788_buck12_set_voltage_sel(struct regulator_dev *rdev,
257 unsigned selector)
258{
259 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
260 enum lp8788_buck_id id = rdev_get_id(rdev);
261 u8 addr;
262
263 if (buck->dvs)
264 lp8788_set_dvs(buck, id);
265
266 addr = lp8788_select_buck_vout_addr(buck, id);
267 if (!lp8788_is_valid_buck_addr(addr))
268 return -EINVAL;
269
270 return lp8788_update_bits(buck->lp, addr, LP8788_VOUT_M, selector);
271}
272
273static int lp8788_buck12_get_voltage_sel(struct regulator_dev *rdev)
274{
275 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
276 enum lp8788_buck_id id = rdev_get_id(rdev);
277 int ret;
278 u8 val, addr;
279
280 addr = lp8788_select_buck_vout_addr(buck, id);
281 if (!lp8788_is_valid_buck_addr(addr))
282 return -EINVAL;
283
284 ret = lp8788_read_byte(buck->lp, addr, &val);
285 if (ret)
286 return ret;
287
288 return val & LP8788_VOUT_M;
289}
290
291static int lp8788_buck_enable_time(struct regulator_dev *rdev)
292{
293 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
294 enum lp8788_buck_id id = rdev_get_id(rdev);
295 u8 val, addr = LP8788_BUCK1_TIMESTEP + id;
296
297 if (lp8788_read_byte(buck->lp, addr, &val))
298 return -EINVAL;
299
300 val = (val & LP8788_STARTUP_TIME_M) >> LP8788_STARTUP_TIME_S;
301
302 return ENABLE_TIME_USEC * val;
303}
304
305static int lp8788_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
306{
307 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
308 enum lp8788_buck_id id = rdev_get_id(rdev);
309 u8 mask, val;
310
311 mask = BUCK_FPWM_MASK(id);
312 switch (mode) {
313 case REGULATOR_MODE_FAST:
314 val = LP8788_FORCE_PWM << BUCK_FPWM_SHIFT(id);
315 break;
316 case REGULATOR_MODE_NORMAL:
317 val = LP8788_AUTO_PWM << BUCK_FPWM_SHIFT(id);
318 break;
319 default:
320 return -EINVAL;
321 }
322
323 return lp8788_update_bits(buck->lp, LP8788_BUCK_PWM, mask, val);
324}
325
326static unsigned int lp8788_buck_get_mode(struct regulator_dev *rdev)
327{
328 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
329 enum lp8788_buck_id id = rdev_get_id(rdev);
330 u8 val;
331 int ret;
332
333 ret = lp8788_read_byte(buck->lp, LP8788_BUCK_PWM, &val);
334 if (ret)
335 return ret;
336
337 return val & BUCK_FPWM_MASK(id) ?
338 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
339}
340
341static const struct regulator_ops lp8788_buck12_ops = {
342 .list_voltage = regulator_list_voltage_linear_range,
343 .map_voltage = regulator_map_voltage_linear_range,
344 .set_voltage_sel = lp8788_buck12_set_voltage_sel,
345 .get_voltage_sel = lp8788_buck12_get_voltage_sel,
346 .enable = regulator_enable_regmap,
347 .disable = regulator_disable_regmap,
348 .is_enabled = regulator_is_enabled_regmap,
349 .enable_time = lp8788_buck_enable_time,
350 .set_mode = lp8788_buck_set_mode,
351 .get_mode = lp8788_buck_get_mode,
352};
353
354static const struct regulator_ops lp8788_buck34_ops = {
355 .list_voltage = regulator_list_voltage_linear_range,
356 .map_voltage = regulator_map_voltage_linear_range,
357 .set_voltage_sel = regulator_set_voltage_sel_regmap,
358 .get_voltage_sel = regulator_get_voltage_sel_regmap,
359 .enable = regulator_enable_regmap,
360 .disable = regulator_disable_regmap,
361 .is_enabled = regulator_is_enabled_regmap,
362 .enable_time = lp8788_buck_enable_time,
363 .set_mode = lp8788_buck_set_mode,
364 .get_mode = lp8788_buck_get_mode,
365};
366
367static const struct regulator_desc lp8788_buck_desc[] = {
368 {
369 .name = "buck1",
370 .id = BUCK1,
371 .ops = &lp8788_buck12_ops,
372 .n_voltages = 26,
373 .linear_ranges = buck_volt_ranges,
374 .n_linear_ranges = ARRAY_SIZE(buck_volt_ranges),
375 .type = REGULATOR_VOLTAGE,
376 .owner = THIS_MODULE,
377 .enable_reg = LP8788_EN_BUCK,
378 .enable_mask = LP8788_EN_BUCK1_M,
379 },
380 {
381 .name = "buck2",
382 .id = BUCK2,
383 .ops = &lp8788_buck12_ops,
384 .n_voltages = 26,
385 .linear_ranges = buck_volt_ranges,
386 .n_linear_ranges = ARRAY_SIZE(buck_volt_ranges),
387 .type = REGULATOR_VOLTAGE,
388 .owner = THIS_MODULE,
389 .enable_reg = LP8788_EN_BUCK,
390 .enable_mask = LP8788_EN_BUCK2_M,
391 },
392 {
393 .name = "buck3",
394 .id = BUCK3,
395 .ops = &lp8788_buck34_ops,
396 .n_voltages = 26,
397 .linear_ranges = buck_volt_ranges,
398 .n_linear_ranges = ARRAY_SIZE(buck_volt_ranges),
399 .type = REGULATOR_VOLTAGE,
400 .owner = THIS_MODULE,
401 .vsel_reg = LP8788_BUCK3_VOUT,
402 .vsel_mask = LP8788_VOUT_M,
403 .enable_reg = LP8788_EN_BUCK,
404 .enable_mask = LP8788_EN_BUCK3_M,
405 },
406 {
407 .name = "buck4",
408 .id = BUCK4,
409 .ops = &lp8788_buck34_ops,
410 .n_voltages = 26,
411 .linear_ranges = buck_volt_ranges,
412 .n_linear_ranges = ARRAY_SIZE(buck_volt_ranges),
413 .type = REGULATOR_VOLTAGE,
414 .owner = THIS_MODULE,
415 .vsel_reg = LP8788_BUCK4_VOUT,
416 .vsel_mask = LP8788_VOUT_M,
417 .enable_reg = LP8788_EN_BUCK,
418 .enable_mask = LP8788_EN_BUCK4_M,
419 },
420};
421
422static int lp8788_dvs_gpio_request(struct platform_device *pdev,
423 struct lp8788_buck *buck,
424 enum lp8788_buck_id id)
425{
426 struct lp8788_platform_data *pdata = buck->lp->pdata;
427 char *b1_name = "LP8788_B1_DVS";
428 char *b2_name[] = { "LP8788_B2_DVS1", "LP8788_B2_DVS2" };
429 int i, gpio, ret;
430
431 switch (id) {
432 case BUCK1:
433 gpio = pdata->buck1_dvs->gpio;
434 ret = devm_gpio_request_one(&pdev->dev, gpio, DVS_LOW,
435 b1_name);
436 if (ret)
437 return ret;
438
439 buck->dvs = pdata->buck1_dvs;
440 break;
441 case BUCK2:
442 for (i = 0; i < LP8788_NUM_BUCK2_DVS; i++) {
443 gpio = pdata->buck2_dvs->gpio[i];
444 ret = devm_gpio_request_one(&pdev->dev, gpio,
445 DVS_LOW, b2_name[i]);
446 if (ret)
447 return ret;
448 }
449 buck->dvs = pdata->buck2_dvs;
450 break;
451 default:
452 break;
453 }
454
455 return 0;
456}
457
458static int lp8788_init_dvs(struct platform_device *pdev,
459 struct lp8788_buck *buck, enum lp8788_buck_id id)
460{
461 struct lp8788_platform_data *pdata = buck->lp->pdata;
462 u8 mask[] = { LP8788_BUCK1_DVS_SEL_M, LP8788_BUCK2_DVS_SEL_M };
463 u8 val[] = { LP8788_BUCK1_DVS_PIN, LP8788_BUCK2_DVS_PIN };
464 u8 default_dvs_mode[] = { LP8788_BUCK1_DVS_I2C, LP8788_BUCK2_DVS_I2C };
465
466 /* no dvs for buck3, 4 */
467 if (id > BUCK2)
468 return 0;
469
470 /* no dvs platform data, then dvs will be selected by I2C registers */
471 if (!pdata)
472 goto set_default_dvs_mode;
473
474 if ((id == BUCK1 && !pdata->buck1_dvs) ||
475 (id == BUCK2 && !pdata->buck2_dvs))
476 goto set_default_dvs_mode;
477
478 if (lp8788_dvs_gpio_request(pdev, buck, id))
479 goto set_default_dvs_mode;
480
481 return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
482 val[id]);
483
484set_default_dvs_mode:
485 return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
486 default_dvs_mode[id]);
487}
488
489static int lp8788_buck_probe(struct platform_device *pdev)
490{
491 struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
492 int id = pdev->id;
493 struct lp8788_buck *buck;
494 struct regulator_config cfg = { };
495 struct regulator_dev *rdev;
496 int ret;
497
498 if (id >= LP8788_NUM_BUCKS)
499 return -EINVAL;
500
501 buck = devm_kzalloc(&pdev->dev, sizeof(struct lp8788_buck), GFP_KERNEL);
502 if (!buck)
503 return -ENOMEM;
504
505 buck->lp = lp;
506
507 ret = lp8788_init_dvs(pdev, buck, id);
508 if (ret)
509 return ret;
510
511 cfg.dev = pdev->dev.parent;
512 cfg.init_data = lp->pdata ? lp->pdata->buck_data[id] : NULL;
513 cfg.driver_data = buck;
514 cfg.regmap = lp->regmap;
515
516 rdev = devm_regulator_register(&pdev->dev, &lp8788_buck_desc[id], &cfg);
517 if (IS_ERR(rdev)) {
518 ret = PTR_ERR(rdev);
519 dev_err(&pdev->dev, "BUCK%d regulator register err = %d\n",
520 id + 1, ret);
521 return ret;
522 }
523
524 buck->regulator = rdev;
525 platform_set_drvdata(pdev, buck);
526
527 return 0;
528}
529
530static struct platform_driver lp8788_buck_driver = {
531 .probe = lp8788_buck_probe,
532 .driver = {
533 .name = LP8788_DEV_BUCK,
534 },
535};
536
537static int __init lp8788_buck_init(void)
538{
539 return platform_driver_register(&lp8788_buck_driver);
540}
541subsys_initcall(lp8788_buck_init);
542
543static void __exit lp8788_buck_exit(void)
544{
545 platform_driver_unregister(&lp8788_buck_driver);
546}
547module_exit(lp8788_buck_exit);
548
549MODULE_DESCRIPTION("TI LP8788 BUCK Driver");
550MODULE_AUTHOR("Milo Kim");
551MODULE_LICENSE("GPL");
552MODULE_ALIAS("platform:lp8788-buck");
1/*
2 * TI LP8788 MFD - buck regulator driver
3 *
4 * Copyright 2012 Texas Instruments
5 *
6 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/err.h>
17#include <linux/platform_device.h>
18#include <linux/regulator/driver.h>
19#include <linux/mfd/lp8788.h>
20#include <linux/gpio.h>
21
22/* register address */
23#define LP8788_EN_BUCK 0x0C
24#define LP8788_BUCK_DVS_SEL 0x1D
25#define LP8788_BUCK1_VOUT0 0x1E
26#define LP8788_BUCK1_VOUT1 0x1F
27#define LP8788_BUCK1_VOUT2 0x20
28#define LP8788_BUCK1_VOUT3 0x21
29#define LP8788_BUCK2_VOUT0 0x22
30#define LP8788_BUCK2_VOUT1 0x23
31#define LP8788_BUCK2_VOUT2 0x24
32#define LP8788_BUCK2_VOUT3 0x25
33#define LP8788_BUCK3_VOUT 0x26
34#define LP8788_BUCK4_VOUT 0x27
35#define LP8788_BUCK1_TIMESTEP 0x28
36#define LP8788_BUCK_PWM 0x2D
37
38/* mask/shift bits */
39#define LP8788_EN_BUCK1_M BIT(0) /* Addr 0Ch */
40#define LP8788_EN_BUCK2_M BIT(1)
41#define LP8788_EN_BUCK3_M BIT(2)
42#define LP8788_EN_BUCK4_M BIT(3)
43#define LP8788_BUCK1_DVS_SEL_M 0x04 /* Addr 1Dh */
44#define LP8788_BUCK1_DVS_M 0x03
45#define LP8788_BUCK1_DVS_S 0
46#define LP8788_BUCK2_DVS_SEL_M 0x40
47#define LP8788_BUCK2_DVS_M 0x30
48#define LP8788_BUCK2_DVS_S 4
49#define LP8788_BUCK1_DVS_I2C BIT(2)
50#define LP8788_BUCK2_DVS_I2C BIT(6)
51#define LP8788_BUCK1_DVS_PIN (0 << 2)
52#define LP8788_BUCK2_DVS_PIN (0 << 6)
53#define LP8788_VOUT_M 0x1F /* Addr 1Eh ~ 27h */
54#define LP8788_STARTUP_TIME_M 0xF8 /* Addr 28h ~ 2Bh */
55#define LP8788_STARTUP_TIME_S 3
56#define LP8788_FPWM_BUCK1_M BIT(0) /* Addr 2Dh */
57#define LP8788_FPWM_BUCK1_S 0
58#define LP8788_FPWM_BUCK2_M BIT(1)
59#define LP8788_FPWM_BUCK2_S 1
60#define LP8788_FPWM_BUCK3_M BIT(2)
61#define LP8788_FPWM_BUCK3_S 2
62#define LP8788_FPWM_BUCK4_M BIT(3)
63#define LP8788_FPWM_BUCK4_S 3
64
65#define INVALID_ADDR 0xFF
66#define LP8788_FORCE_PWM 1
67#define LP8788_AUTO_PWM 0
68#define PIN_LOW 0
69#define PIN_HIGH 1
70#define ENABLE_TIME_USEC 32
71
72#define BUCK_FPWM_MASK(x) (1 << (x))
73#define BUCK_FPWM_SHIFT(x) (x)
74
75enum lp8788_dvs_state {
76 DVS_LOW = GPIOF_OUT_INIT_LOW,
77 DVS_HIGH = GPIOF_OUT_INIT_HIGH,
78};
79
80enum lp8788_dvs_mode {
81 REGISTER,
82 EXTPIN,
83};
84
85enum lp8788_buck_id {
86 BUCK1,
87 BUCK2,
88 BUCK3,
89 BUCK4,
90};
91
92struct lp8788_buck {
93 struct lp8788 *lp;
94 struct regulator_dev *regulator;
95 void *dvs;
96};
97
98/* BUCK 1 ~ 4 voltage table */
99static const int lp8788_buck_vtbl[] = {
100 500000, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
101 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
102 1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
103 1950000, 2000000,
104};
105
106static void lp8788_buck1_set_dvs(struct lp8788_buck *buck)
107{
108 struct lp8788_buck1_dvs *dvs = (struct lp8788_buck1_dvs *)buck->dvs;
109 enum lp8788_dvs_state pinstate;
110
111 if (!dvs)
112 return;
113
114 pinstate = dvs->vsel == DVS_SEL_V0 ? DVS_LOW : DVS_HIGH;
115 if (gpio_is_valid(dvs->gpio))
116 gpio_set_value(dvs->gpio, pinstate);
117}
118
119static void lp8788_buck2_set_dvs(struct lp8788_buck *buck)
120{
121 struct lp8788_buck2_dvs *dvs = (struct lp8788_buck2_dvs *)buck->dvs;
122 enum lp8788_dvs_state pin1, pin2;
123
124 if (!dvs)
125 return;
126
127 switch (dvs->vsel) {
128 case DVS_SEL_V0:
129 pin1 = DVS_LOW;
130 pin2 = DVS_LOW;
131 break;
132 case DVS_SEL_V1:
133 pin1 = DVS_HIGH;
134 pin2 = DVS_LOW;
135 break;
136 case DVS_SEL_V2:
137 pin1 = DVS_LOW;
138 pin2 = DVS_HIGH;
139 break;
140 case DVS_SEL_V3:
141 pin1 = DVS_HIGH;
142 pin2 = DVS_HIGH;
143 break;
144 default:
145 return;
146 }
147
148 if (gpio_is_valid(dvs->gpio[0]))
149 gpio_set_value(dvs->gpio[0], pin1);
150
151 if (gpio_is_valid(dvs->gpio[1]))
152 gpio_set_value(dvs->gpio[1], pin2);
153}
154
155static void lp8788_set_dvs(struct lp8788_buck *buck, enum lp8788_buck_id id)
156{
157 switch (id) {
158 case BUCK1:
159 lp8788_buck1_set_dvs(buck);
160 break;
161 case BUCK2:
162 lp8788_buck2_set_dvs(buck);
163 break;
164 default:
165 break;
166 }
167}
168
169static enum lp8788_dvs_mode
170lp8788_get_buck_dvs_ctrl_mode(struct lp8788_buck *buck, enum lp8788_buck_id id)
171{
172 u8 val, mask;
173
174 switch (id) {
175 case BUCK1:
176 mask = LP8788_BUCK1_DVS_SEL_M;
177 break;
178 case BUCK2:
179 mask = LP8788_BUCK2_DVS_SEL_M;
180 break;
181 default:
182 return REGISTER;
183 }
184
185 lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
186
187 return val & mask ? REGISTER : EXTPIN;
188}
189
190static bool lp8788_is_valid_buck_addr(u8 addr)
191{
192 switch (addr) {
193 case LP8788_BUCK1_VOUT0:
194 case LP8788_BUCK1_VOUT1:
195 case LP8788_BUCK1_VOUT2:
196 case LP8788_BUCK1_VOUT3:
197 case LP8788_BUCK2_VOUT0:
198 case LP8788_BUCK2_VOUT1:
199 case LP8788_BUCK2_VOUT2:
200 case LP8788_BUCK2_VOUT3:
201 return true;
202 default:
203 return false;
204 }
205}
206
207static u8 lp8788_select_buck_vout_addr(struct lp8788_buck *buck,
208 enum lp8788_buck_id id)
209{
210 enum lp8788_dvs_mode mode = lp8788_get_buck_dvs_ctrl_mode(buck, id);
211 struct lp8788_buck1_dvs *b1_dvs;
212 struct lp8788_buck2_dvs *b2_dvs;
213 u8 val, idx, addr;
214 int pin1, pin2;
215
216 switch (id) {
217 case BUCK1:
218 if (mode == EXTPIN) {
219 b1_dvs = (struct lp8788_buck1_dvs *)buck->dvs;
220 if (!b1_dvs)
221 goto err;
222
223 idx = gpio_get_value(b1_dvs->gpio) ? 1 : 0;
224 } else {
225 lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
226 idx = (val & LP8788_BUCK1_DVS_M) >> LP8788_BUCK1_DVS_S;
227 }
228 addr = LP8788_BUCK1_VOUT0 + idx;
229 break;
230 case BUCK2:
231 if (mode == EXTPIN) {
232 b2_dvs = (struct lp8788_buck2_dvs *)buck->dvs;
233 if (!b2_dvs)
234 goto err;
235
236 pin1 = gpio_get_value(b2_dvs->gpio[0]);
237 pin2 = gpio_get_value(b2_dvs->gpio[1]);
238
239 if (pin1 == PIN_LOW && pin2 == PIN_LOW)
240 idx = 0;
241 else if (pin1 == PIN_LOW && pin2 == PIN_HIGH)
242 idx = 2;
243 else if (pin1 == PIN_HIGH && pin2 == PIN_LOW)
244 idx = 1;
245 else
246 idx = 3;
247 } else {
248 lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
249 idx = (val & LP8788_BUCK2_DVS_M) >> LP8788_BUCK2_DVS_S;
250 }
251 addr = LP8788_BUCK2_VOUT0 + idx;
252 break;
253 default:
254 goto err;
255 }
256
257 return addr;
258err:
259 return INVALID_ADDR;
260}
261
262static int lp8788_buck12_set_voltage_sel(struct regulator_dev *rdev,
263 unsigned selector)
264{
265 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
266 enum lp8788_buck_id id = rdev_get_id(rdev);
267 u8 addr;
268
269 if (buck->dvs)
270 lp8788_set_dvs(buck, id);
271
272 addr = lp8788_select_buck_vout_addr(buck, id);
273 if (!lp8788_is_valid_buck_addr(addr))
274 return -EINVAL;
275
276 return lp8788_update_bits(buck->lp, addr, LP8788_VOUT_M, selector);
277}
278
279static int lp8788_buck12_get_voltage_sel(struct regulator_dev *rdev)
280{
281 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
282 enum lp8788_buck_id id = rdev_get_id(rdev);
283 int ret;
284 u8 val, addr;
285
286 addr = lp8788_select_buck_vout_addr(buck, id);
287 if (!lp8788_is_valid_buck_addr(addr))
288 return -EINVAL;
289
290 ret = lp8788_read_byte(buck->lp, addr, &val);
291 if (ret)
292 return ret;
293
294 return val & LP8788_VOUT_M;
295}
296
297static int lp8788_buck_enable_time(struct regulator_dev *rdev)
298{
299 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
300 enum lp8788_buck_id id = rdev_get_id(rdev);
301 u8 val, addr = LP8788_BUCK1_TIMESTEP + id;
302
303 if (lp8788_read_byte(buck->lp, addr, &val))
304 return -EINVAL;
305
306 val = (val & LP8788_STARTUP_TIME_M) >> LP8788_STARTUP_TIME_S;
307
308 return ENABLE_TIME_USEC * val;
309}
310
311static int lp8788_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
312{
313 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
314 enum lp8788_buck_id id = rdev_get_id(rdev);
315 u8 mask, val;
316
317 mask = BUCK_FPWM_MASK(id);
318 switch (mode) {
319 case REGULATOR_MODE_FAST:
320 val = LP8788_FORCE_PWM << BUCK_FPWM_SHIFT(id);
321 break;
322 case REGULATOR_MODE_NORMAL:
323 val = LP8788_AUTO_PWM << BUCK_FPWM_SHIFT(id);
324 break;
325 default:
326 return -EINVAL;
327 }
328
329 return lp8788_update_bits(buck->lp, LP8788_BUCK_PWM, mask, val);
330}
331
332static unsigned int lp8788_buck_get_mode(struct regulator_dev *rdev)
333{
334 struct lp8788_buck *buck = rdev_get_drvdata(rdev);
335 enum lp8788_buck_id id = rdev_get_id(rdev);
336 u8 val;
337 int ret;
338
339 ret = lp8788_read_byte(buck->lp, LP8788_BUCK_PWM, &val);
340 if (ret)
341 return ret;
342
343 return val & BUCK_FPWM_MASK(id) ?
344 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
345}
346
347static struct regulator_ops lp8788_buck12_ops = {
348 .list_voltage = regulator_list_voltage_table,
349 .map_voltage = regulator_map_voltage_ascend,
350 .set_voltage_sel = lp8788_buck12_set_voltage_sel,
351 .get_voltage_sel = lp8788_buck12_get_voltage_sel,
352 .enable = regulator_enable_regmap,
353 .disable = regulator_disable_regmap,
354 .is_enabled = regulator_is_enabled_regmap,
355 .enable_time = lp8788_buck_enable_time,
356 .set_mode = lp8788_buck_set_mode,
357 .get_mode = lp8788_buck_get_mode,
358};
359
360static struct regulator_ops lp8788_buck34_ops = {
361 .list_voltage = regulator_list_voltage_table,
362 .map_voltage = regulator_map_voltage_ascend,
363 .set_voltage_sel = regulator_set_voltage_sel_regmap,
364 .get_voltage_sel = regulator_get_voltage_sel_regmap,
365 .enable = regulator_enable_regmap,
366 .disable = regulator_disable_regmap,
367 .is_enabled = regulator_is_enabled_regmap,
368 .enable_time = lp8788_buck_enable_time,
369 .set_mode = lp8788_buck_set_mode,
370 .get_mode = lp8788_buck_get_mode,
371};
372
373static struct regulator_desc lp8788_buck_desc[] = {
374 {
375 .name = "buck1",
376 .id = BUCK1,
377 .ops = &lp8788_buck12_ops,
378 .n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
379 .volt_table = lp8788_buck_vtbl,
380 .type = REGULATOR_VOLTAGE,
381 .owner = THIS_MODULE,
382 .enable_reg = LP8788_EN_BUCK,
383 .enable_mask = LP8788_EN_BUCK1_M,
384 },
385 {
386 .name = "buck2",
387 .id = BUCK2,
388 .ops = &lp8788_buck12_ops,
389 .n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
390 .volt_table = lp8788_buck_vtbl,
391 .type = REGULATOR_VOLTAGE,
392 .owner = THIS_MODULE,
393 .enable_reg = LP8788_EN_BUCK,
394 .enable_mask = LP8788_EN_BUCK2_M,
395 },
396 {
397 .name = "buck3",
398 .id = BUCK3,
399 .ops = &lp8788_buck34_ops,
400 .n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
401 .volt_table = lp8788_buck_vtbl,
402 .type = REGULATOR_VOLTAGE,
403 .owner = THIS_MODULE,
404 .vsel_reg = LP8788_BUCK3_VOUT,
405 .vsel_mask = LP8788_VOUT_M,
406 .enable_reg = LP8788_EN_BUCK,
407 .enable_mask = LP8788_EN_BUCK3_M,
408 },
409 {
410 .name = "buck4",
411 .id = BUCK4,
412 .ops = &lp8788_buck34_ops,
413 .n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
414 .volt_table = lp8788_buck_vtbl,
415 .type = REGULATOR_VOLTAGE,
416 .owner = THIS_MODULE,
417 .vsel_reg = LP8788_BUCK4_VOUT,
418 .vsel_mask = LP8788_VOUT_M,
419 .enable_reg = LP8788_EN_BUCK,
420 .enable_mask = LP8788_EN_BUCK4_M,
421 },
422};
423
424static int lp8788_dvs_gpio_request(struct platform_device *pdev,
425 struct lp8788_buck *buck,
426 enum lp8788_buck_id id)
427{
428 struct lp8788_platform_data *pdata = buck->lp->pdata;
429 char *b1_name = "LP8788_B1_DVS";
430 char *b2_name[] = { "LP8788_B2_DVS1", "LP8788_B2_DVS2" };
431 int i, gpio, ret;
432
433 switch (id) {
434 case BUCK1:
435 gpio = pdata->buck1_dvs->gpio;
436 ret = devm_gpio_request_one(&pdev->dev, gpio, DVS_LOW,
437 b1_name);
438 if (ret)
439 return ret;
440
441 buck->dvs = pdata->buck1_dvs;
442 break;
443 case BUCK2:
444 for (i = 0; i < LP8788_NUM_BUCK2_DVS; i++) {
445 gpio = pdata->buck2_dvs->gpio[i];
446 ret = devm_gpio_request_one(&pdev->dev, gpio,
447 DVS_LOW, b2_name[i]);
448 if (ret)
449 return ret;
450 }
451 buck->dvs = pdata->buck2_dvs;
452 break;
453 default:
454 break;
455 }
456
457 return 0;
458}
459
460static int lp8788_init_dvs(struct platform_device *pdev,
461 struct lp8788_buck *buck, enum lp8788_buck_id id)
462{
463 struct lp8788_platform_data *pdata = buck->lp->pdata;
464 u8 mask[] = { LP8788_BUCK1_DVS_SEL_M, LP8788_BUCK2_DVS_SEL_M };
465 u8 val[] = { LP8788_BUCK1_DVS_PIN, LP8788_BUCK2_DVS_PIN };
466 u8 default_dvs_mode[] = { LP8788_BUCK1_DVS_I2C, LP8788_BUCK2_DVS_I2C };
467
468 /* no dvs for buck3, 4 */
469 if (id > BUCK2)
470 return 0;
471
472 /* no dvs platform data, then dvs will be selected by I2C registers */
473 if (!pdata)
474 goto set_default_dvs_mode;
475
476 if ((id == BUCK1 && !pdata->buck1_dvs) ||
477 (id == BUCK2 && !pdata->buck2_dvs))
478 goto set_default_dvs_mode;
479
480 if (lp8788_dvs_gpio_request(pdev, buck, id))
481 goto set_default_dvs_mode;
482
483 return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
484 val[id]);
485
486set_default_dvs_mode:
487 return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
488 default_dvs_mode[id]);
489}
490
491static int lp8788_buck_probe(struct platform_device *pdev)
492{
493 struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
494 int id = pdev->id;
495 struct lp8788_buck *buck;
496 struct regulator_config cfg = { };
497 struct regulator_dev *rdev;
498 int ret;
499
500 if (id >= LP8788_NUM_BUCKS)
501 return -EINVAL;
502
503 buck = devm_kzalloc(&pdev->dev, sizeof(struct lp8788_buck), GFP_KERNEL);
504 if (!buck)
505 return -ENOMEM;
506
507 buck->lp = lp;
508
509 ret = lp8788_init_dvs(pdev, buck, id);
510 if (ret)
511 return ret;
512
513 cfg.dev = pdev->dev.parent;
514 cfg.init_data = lp->pdata ? lp->pdata->buck_data[id] : NULL;
515 cfg.driver_data = buck;
516 cfg.regmap = lp->regmap;
517
518 rdev = devm_regulator_register(&pdev->dev, &lp8788_buck_desc[id], &cfg);
519 if (IS_ERR(rdev)) {
520 ret = PTR_ERR(rdev);
521 dev_err(&pdev->dev, "BUCK%d regulator register err = %d\n",
522 id + 1, ret);
523 return ret;
524 }
525
526 buck->regulator = rdev;
527 platform_set_drvdata(pdev, buck);
528
529 return 0;
530}
531
532static struct platform_driver lp8788_buck_driver = {
533 .probe = lp8788_buck_probe,
534 .driver = {
535 .name = LP8788_DEV_BUCK,
536 .owner = THIS_MODULE,
537 },
538};
539
540static int __init lp8788_buck_init(void)
541{
542 return platform_driver_register(&lp8788_buck_driver);
543}
544subsys_initcall(lp8788_buck_init);
545
546static void __exit lp8788_buck_exit(void)
547{
548 platform_driver_unregister(&lp8788_buck_driver);
549}
550module_exit(lp8788_buck_exit);
551
552MODULE_DESCRIPTION("TI LP8788 BUCK Driver");
553MODULE_AUTHOR("Milo Kim");
554MODULE_LICENSE("GPL");
555MODULE_ALIAS("platform:lp8788-buck");