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
75 enum lp8788_dvs_state {
76 DVS_LOW = GPIOF_OUT_INIT_LOW,
77 DVS_HIGH = GPIOF_OUT_INIT_HIGH,
78 };
79
80 enum lp8788_dvs_mode {
81 REGISTER,
82 EXTPIN,
83 };
84
85 enum lp8788_buck_id {
86 BUCK1,
87 BUCK2,
88 BUCK3,
89 BUCK4,
90 };
91
92 struct lp8788_buck {
93 struct lp8788 *lp;
94 struct regulator_dev *regulator;
95 void *dvs;
96 };
97
98 /* BUCK 1 ~ 4 voltage table */
99 static 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
lp8788_buck1_set_dvs(struct lp8788_buck * buck)106 static 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
lp8788_buck2_set_dvs(struct lp8788_buck * buck)119 static 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
lp8788_set_dvs(struct lp8788_buck * buck,enum lp8788_buck_id id)155 static 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
169 static enum lp8788_dvs_mode
lp8788_get_buck_dvs_ctrl_mode(struct lp8788_buck * buck,enum lp8788_buck_id id)170 lp8788_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
lp8788_is_valid_buck_addr(u8 addr)190 static 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
lp8788_select_buck_vout_addr(struct lp8788_buck * buck,enum lp8788_buck_id id)207 static 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;
258 err:
259 return INVALID_ADDR;
260 }
261
lp8788_buck12_set_voltage_sel(struct regulator_dev * rdev,unsigned selector)262 static 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
lp8788_buck12_get_voltage_sel(struct regulator_dev * rdev)279 static 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
lp8788_buck_enable_time(struct regulator_dev * rdev)297 static 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
lp8788_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)311 static 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
lp8788_buck_get_mode(struct regulator_dev * rdev)332 static 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
347 static const 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
360 static const 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
373 static 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
lp8788_dvs_gpio_request(struct platform_device * pdev,struct lp8788_buck * buck,enum lp8788_buck_id id)424 static 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
lp8788_init_dvs(struct platform_device * pdev,struct lp8788_buck * buck,enum lp8788_buck_id id)460 static 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
486 set_default_dvs_mode:
487 return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
488 default_dvs_mode[id]);
489 }
490
lp8788_buck_probe(struct platform_device * pdev)491 static 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
532 static struct platform_driver lp8788_buck_driver = {
533 .probe = lp8788_buck_probe,
534 .driver = {
535 .name = LP8788_DEV_BUCK,
536 },
537 };
538
lp8788_buck_init(void)539 static int __init lp8788_buck_init(void)
540 {
541 return platform_driver_register(&lp8788_buck_driver);
542 }
543 subsys_initcall(lp8788_buck_init);
544
lp8788_buck_exit(void)545 static void __exit lp8788_buck_exit(void)
546 {
547 platform_driver_unregister(&lp8788_buck_driver);
548 }
549 module_exit(lp8788_buck_exit);
550
551 MODULE_DESCRIPTION("TI LP8788 BUCK Driver");
552 MODULE_AUTHOR("Milo Kim");
553 MODULE_LICENSE("GPL");
554 MODULE_ALIAS("platform:lp8788-buck");
555