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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b59320cc DJ |
2 | /* |
3 | * LP8755 High Performance Power Management Unit : System Interface Driver | |
4 | * (based on rev. 0.26) | |
5 | * Copyright 2012 Texas Instruments | |
6 | * | |
7 | * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com> | |
b59320cc DJ |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/irq.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/gpio.h> | |
17 | #include <linux/regmap.h> | |
b59320cc DJ |
18 | #include <linux/uaccess.h> |
19 | #include <linux/regulator/driver.h> | |
20 | #include <linux/regulator/machine.h> | |
21 | #include <linux/platform_data/lp8755.h> | |
22 | ||
23 | #define LP8755_REG_BUCK0 0x00 | |
24 | #define LP8755_REG_BUCK1 0x03 | |
25 | #define LP8755_REG_BUCK2 0x04 | |
26 | #define LP8755_REG_BUCK3 0x01 | |
27 | #define LP8755_REG_BUCK4 0x05 | |
28 | #define LP8755_REG_BUCK5 0x02 | |
29 | #define LP8755_REG_MAX 0xFF | |
30 | ||
31 | #define LP8755_BUCK_EN_M BIT(7) | |
32 | #define LP8755_BUCK_LINEAR_OUT_MAX 0x76 | |
33 | #define LP8755_BUCK_VOUT_M 0x7F | |
34 | ||
b59320cc DJ |
35 | struct lp8755_mphase { |
36 | int nreg; | |
37 | int buck_num[LP8755_BUCK_MAX]; | |
38 | }; | |
39 | ||
40 | struct lp8755_chip { | |
41 | struct device *dev; | |
42 | struct regmap *regmap; | |
43 | struct lp8755_platform_data *pdata; | |
44 | ||
45 | int irq; | |
46 | unsigned int irqmask; | |
47 | ||
48 | int mphase; | |
49 | struct regulator_dev *rdev[LP8755_BUCK_MAX]; | |
50 | }; | |
51 | ||
b59320cc DJ |
52 | static int lp8755_buck_enable_time(struct regulator_dev *rdev) |
53 | { | |
54 | int ret; | |
55 | unsigned int regval; | |
56 | enum lp8755_bucks id = rdev_get_id(rdev); | |
b59320cc | 57 | |
4cf12735 | 58 | ret = regmap_read(rdev->regmap, 0x12 + id, ®val); |
b59320cc | 59 | if (ret < 0) { |
4cf12735 | 60 | dev_err(&rdev->dev, "i2c access error %s\n", __func__); |
b59320cc DJ |
61 | return ret; |
62 | } | |
63 | return (regval & 0xff) * 100; | |
64 | } | |
65 | ||
66 | static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
67 | { | |
68 | int ret; | |
69 | unsigned int regbval = 0x0; | |
70 | enum lp8755_bucks id = rdev_get_id(rdev); | |
71 | struct lp8755_chip *pchip = rdev_get_drvdata(rdev); | |
72 | ||
73 | switch (mode) { | |
74 | case REGULATOR_MODE_FAST: | |
75 | /* forced pwm mode */ | |
76 | regbval = (0x01 << id); | |
77 | break; | |
78 | case REGULATOR_MODE_NORMAL: | |
79 | /* enable automatic pwm/pfm mode */ | |
4cf12735 | 80 | ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00); |
b59320cc DJ |
81 | if (ret < 0) |
82 | goto err_i2c; | |
83 | break; | |
84 | case REGULATOR_MODE_IDLE: | |
85 | /* enable automatic pwm/pfm/lppfm mode */ | |
4cf12735 | 86 | ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20); |
b59320cc DJ |
87 | if (ret < 0) |
88 | goto err_i2c; | |
89 | ||
4cf12735 | 90 | ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01); |
b59320cc DJ |
91 | if (ret < 0) |
92 | goto err_i2c; | |
93 | break; | |
94 | default: | |
95 | dev_err(pchip->dev, "Not supported buck mode %s\n", __func__); | |
96 | /* forced pwm mode */ | |
97 | regbval = (0x01 << id); | |
98 | } | |
99 | ||
4cf12735 | 100 | ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval); |
b59320cc DJ |
101 | if (ret < 0) |
102 | goto err_i2c; | |
103 | return ret; | |
104 | err_i2c: | |
4cf12735 | 105 | dev_err(&rdev->dev, "i2c access error %s\n", __func__); |
b59320cc DJ |
106 | return ret; |
107 | } | |
108 | ||
109 | static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev) | |
110 | { | |
111 | int ret; | |
112 | unsigned int regval; | |
113 | enum lp8755_bucks id = rdev_get_id(rdev); | |
b59320cc | 114 | |
4cf12735 | 115 | ret = regmap_read(rdev->regmap, 0x06, ®val); |
b59320cc DJ |
116 | if (ret < 0) |
117 | goto err_i2c; | |
118 | ||
119 | /* mode fast means forced pwm mode */ | |
120 | if (regval & (0x01 << id)) | |
121 | return REGULATOR_MODE_FAST; | |
122 | ||
4cf12735 | 123 | ret = regmap_read(rdev->regmap, 0x08 + id, ®val); |
b59320cc DJ |
124 | if (ret < 0) |
125 | goto err_i2c; | |
126 | ||
127 | /* mode idle means automatic pwm/pfm/lppfm mode */ | |
128 | if (regval & 0x20) | |
129 | return REGULATOR_MODE_IDLE; | |
130 | ||
131 | /* mode normal means automatic pwm/pfm mode */ | |
132 | return REGULATOR_MODE_NORMAL; | |
133 | ||
134 | err_i2c: | |
4cf12735 | 135 | dev_err(&rdev->dev, "i2c access error %s\n", __func__); |
b59320cc DJ |
136 | return 0; |
137 | } | |
138 | ||
fbd168cd AL |
139 | static const unsigned int lp8755_buck_ramp_table[] = { |
140 | 30000, 15000, 7500, 3800, 1900, 940, 470, 230 | |
141 | }; | |
b59320cc | 142 | |
d42797a4 | 143 | static const struct regulator_ops lp8755_buck_ops = { |
56a942e9 | 144 | .map_voltage = regulator_map_voltage_linear, |
b59320cc DJ |
145 | .list_voltage = regulator_list_voltage_linear, |
146 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
147 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
148 | .enable = regulator_enable_regmap, | |
149 | .disable = regulator_disable_regmap, | |
150 | .is_enabled = regulator_is_enabled_regmap, | |
151 | .enable_time = lp8755_buck_enable_time, | |
152 | .set_mode = lp8755_buck_set_mode, | |
153 | .get_mode = lp8755_buck_get_mode, | |
fbd168cd | 154 | .set_ramp_delay = regulator_set_ramp_delay_regmap, |
b59320cc DJ |
155 | }; |
156 | ||
157 | #define lp8755_rail(_id) "lp8755_buck"#_id | |
158 | #define lp8755_buck_init(_id)\ | |
159 | {\ | |
160 | .constraints = {\ | |
161 | .name = lp8755_rail(_id),\ | |
162 | .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\ | |
163 | .min_uV = 500000,\ | |
164 | .max_uV = 1675000,\ | |
165 | },\ | |
166 | } | |
167 | ||
168 | static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = { | |
510799ea AL |
169 | [LP8755_BUCK0] = lp8755_buck_init(0), |
170 | [LP8755_BUCK1] = lp8755_buck_init(1), | |
171 | [LP8755_BUCK2] = lp8755_buck_init(2), | |
172 | [LP8755_BUCK3] = lp8755_buck_init(3), | |
173 | [LP8755_BUCK4] = lp8755_buck_init(4), | |
174 | [LP8755_BUCK5] = lp8755_buck_init(5), | |
b59320cc DJ |
175 | }; |
176 | ||
177 | static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = { | |
510799ea AL |
178 | { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } }, |
179 | { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3, | |
180 | LP8755_BUCK4, LP8755_BUCK5 } }, | |
181 | { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4, | |
182 | LP8755_BUCK5} }, | |
183 | { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} }, | |
184 | { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} }, | |
185 | { 2, { LP8755_BUCK0, LP8755_BUCK5} }, | |
186 | { 1, { LP8755_BUCK0} }, | |
187 | { 2, { LP8755_BUCK0, LP8755_BUCK3} }, | |
188 | { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} }, | |
b59320cc DJ |
189 | }; |
190 | ||
191 | static int lp8755_init_data(struct lp8755_chip *pchip) | |
192 | { | |
193 | unsigned int regval; | |
194 | int ret, icnt, buck_num; | |
195 | struct lp8755_platform_data *pdata = pchip->pdata; | |
196 | ||
197 | /* read back muti-phase configuration */ | |
4cf12735 | 198 | ret = regmap_read(pchip->regmap, 0x3D, ®val); |
b59320cc DJ |
199 | if (ret < 0) |
200 | goto out_i2c_error; | |
cad877ef | 201 | pchip->mphase = regval & 0x0F; |
b59320cc DJ |
202 | |
203 | /* set default data based on multi-phase config */ | |
204 | for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { | |
205 | buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; | |
206 | pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num]; | |
207 | } | |
208 | return ret; | |
209 | ||
210 | out_i2c_error: | |
80aec6f5 | 211 | dev_err(pchip->dev, "i2c access error %s\n", __func__); |
b59320cc DJ |
212 | return ret; |
213 | } | |
214 | ||
215 | #define lp8755_buck_desc(_id)\ | |
216 | {\ | |
217 | .name = lp8755_rail(_id),\ | |
218 | .id = LP8755_BUCK##_id,\ | |
219 | .ops = &lp8755_buck_ops,\ | |
220 | .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\ | |
221 | .uV_step = 10000,\ | |
222 | .min_uV = 500000,\ | |
223 | .type = REGULATOR_VOLTAGE,\ | |
224 | .owner = THIS_MODULE,\ | |
225 | .enable_reg = LP8755_REG_BUCK##_id,\ | |
226 | .enable_mask = LP8755_BUCK_EN_M,\ | |
227 | .vsel_reg = LP8755_REG_BUCK##_id,\ | |
228 | .vsel_mask = LP8755_BUCK_VOUT_M,\ | |
fbd168cd AL |
229 | .ramp_reg = (LP8755_BUCK##_id) + 0x7,\ |
230 | .ramp_mask = 0x7,\ | |
231 | .ramp_delay_table = lp8755_buck_ramp_table,\ | |
232 | .n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\ | |
b59320cc DJ |
233 | } |
234 | ||
367e90d1 | 235 | static const struct regulator_desc lp8755_regulators[] = { |
b59320cc DJ |
236 | lp8755_buck_desc(0), |
237 | lp8755_buck_desc(1), | |
238 | lp8755_buck_desc(2), | |
239 | lp8755_buck_desc(3), | |
240 | lp8755_buck_desc(4), | |
241 | lp8755_buck_desc(5), | |
242 | }; | |
243 | ||
244 | static int lp8755_regulator_init(struct lp8755_chip *pchip) | |
245 | { | |
246 | int ret, icnt, buck_num; | |
247 | struct lp8755_platform_data *pdata = pchip->pdata; | |
248 | struct regulator_config rconfig = { }; | |
249 | ||
250 | rconfig.regmap = pchip->regmap; | |
251 | rconfig.dev = pchip->dev; | |
252 | rconfig.driver_data = pchip; | |
253 | ||
254 | for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { | |
255 | buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; | |
256 | rconfig.init_data = pdata->buck_data[buck_num]; | |
257 | rconfig.of_node = pchip->dev->of_node; | |
258 | pchip->rdev[buck_num] = | |
57135250 HS |
259 | devm_regulator_register(pchip->dev, |
260 | &lp8755_regulators[buck_num], &rconfig); | |
b59320cc DJ |
261 | if (IS_ERR(pchip->rdev[buck_num])) { |
262 | ret = PTR_ERR(pchip->rdev[buck_num]); | |
a1a41ab4 AL |
263 | pchip->rdev[buck_num] = NULL; |
264 | dev_err(pchip->dev, "regulator init failed: buck %d\n", | |
265 | buck_num); | |
57135250 | 266 | return ret; |
b59320cc DJ |
267 | } |
268 | } | |
269 | ||
270 | return 0; | |
b59320cc DJ |
271 | } |
272 | ||
273 | static irqreturn_t lp8755_irq_handler(int irq, void *data) | |
274 | { | |
275 | int ret, icnt; | |
276 | unsigned int flag0, flag1; | |
277 | struct lp8755_chip *pchip = data; | |
278 | ||
279 | /* read flag0 register */ | |
4cf12735 | 280 | ret = regmap_read(pchip->regmap, 0x0D, &flag0); |
b59320cc DJ |
281 | if (ret < 0) |
282 | goto err_i2c; | |
283 | /* clear flag register to pull up int. pin */ | |
4cf12735 | 284 | ret = regmap_write(pchip->regmap, 0x0D, 0x00); |
b59320cc DJ |
285 | if (ret < 0) |
286 | goto err_i2c; | |
287 | ||
288 | /* sent power fault detection event to specific regulator */ | |
1200c60b | 289 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
b59320cc DJ |
290 | if ((flag0 & (0x4 << icnt)) |
291 | && (pchip->irqmask & (0x04 << icnt)) | |
89b2758c | 292 | && (pchip->rdev[icnt] != NULL)) { |
b59320cc DJ |
293 | regulator_notifier_call_chain(pchip->rdev[icnt], |
294 | LP8755_EVENT_PWR_FAULT, | |
295 | NULL); | |
89b2758c | 296 | } |
b59320cc DJ |
297 | |
298 | /* read flag1 register */ | |
4cf12735 | 299 | ret = regmap_read(pchip->regmap, 0x0E, &flag1); |
b59320cc DJ |
300 | if (ret < 0) |
301 | goto err_i2c; | |
302 | /* clear flag register to pull up int. pin */ | |
4cf12735 | 303 | ret = regmap_write(pchip->regmap, 0x0E, 0x00); |
b59320cc DJ |
304 | if (ret < 0) |
305 | goto err_i2c; | |
306 | ||
48f1b4ef | 307 | /* send OCP event to all regulator devices */ |
b59320cc DJ |
308 | if ((flag1 & 0x01) && (pchip->irqmask & 0x01)) |
309 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) | |
89b2758c | 310 | if (pchip->rdev[icnt] != NULL) { |
b59320cc DJ |
311 | regulator_notifier_call_chain(pchip->rdev[icnt], |
312 | LP8755_EVENT_OCP, | |
313 | NULL); | |
89b2758c | 314 | } |
b59320cc | 315 | |
48f1b4ef | 316 | /* send OVP event to all regulator devices */ |
b59320cc DJ |
317 | if ((flag1 & 0x02) && (pchip->irqmask & 0x02)) |
318 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) | |
89b2758c | 319 | if (pchip->rdev[icnt] != NULL) { |
b59320cc DJ |
320 | regulator_notifier_call_chain(pchip->rdev[icnt], |
321 | LP8755_EVENT_OVP, | |
322 | NULL); | |
89b2758c | 323 | } |
b59320cc DJ |
324 | return IRQ_HANDLED; |
325 | ||
326 | err_i2c: | |
80aec6f5 | 327 | dev_err(pchip->dev, "i2c access error %s\n", __func__); |
b59320cc DJ |
328 | return IRQ_NONE; |
329 | } | |
330 | ||
331 | static int lp8755_int_config(struct lp8755_chip *pchip) | |
332 | { | |
333 | int ret; | |
334 | unsigned int regval; | |
335 | ||
336 | if (pchip->irq == 0) { | |
337 | dev_warn(pchip->dev, "not use interrupt : %s\n", __func__); | |
338 | return 0; | |
339 | } | |
340 | ||
4cf12735 | 341 | ret = regmap_read(pchip->regmap, 0x0F, ®val); |
840499aa | 342 | if (ret < 0) { |
80aec6f5 | 343 | dev_err(pchip->dev, "i2c access error %s\n", __func__); |
b59320cc | 344 | return ret; |
840499aa | 345 | } |
b59320cc | 346 | |
840499aa AL |
347 | pchip->irqmask = regval; |
348 | return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL, | |
349 | lp8755_irq_handler, | |
350 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
351 | "lp8755-irq", pchip); | |
b59320cc DJ |
352 | } |
353 | ||
354 | static const struct regmap_config lp8755_regmap = { | |
355 | .reg_bits = 8, | |
356 | .val_bits = 8, | |
357 | .max_register = LP8755_REG_MAX, | |
358 | }; | |
359 | ||
cb28f74b | 360 | static int lp8755_probe(struct i2c_client *client) |
b59320cc DJ |
361 | { |
362 | int ret, icnt; | |
363 | struct lp8755_chip *pchip; | |
dff91d0b | 364 | struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev); |
b59320cc DJ |
365 | |
366 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
367 | dev_err(&client->dev, "i2c functionality check fail.\n"); | |
368 | return -EOPNOTSUPP; | |
369 | } | |
370 | ||
371 | pchip = devm_kzalloc(&client->dev, | |
372 | sizeof(struct lp8755_chip), GFP_KERNEL); | |
373 | if (!pchip) | |
374 | return -ENOMEM; | |
375 | ||
376 | pchip->dev = &client->dev; | |
377 | pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap); | |
378 | if (IS_ERR(pchip->regmap)) { | |
379 | ret = PTR_ERR(pchip->regmap); | |
380 | dev_err(&client->dev, "fail to allocate regmap %d\n", ret); | |
381 | return ret; | |
382 | } | |
383 | i2c_set_clientdata(client, pchip); | |
384 | ||
385 | if (pdata != NULL) { | |
386 | pchip->pdata = pdata; | |
387 | pchip->mphase = pdata->mphase; | |
388 | } else { | |
389 | pchip->pdata = devm_kzalloc(pchip->dev, | |
390 | sizeof(struct lp8755_platform_data), | |
391 | GFP_KERNEL); | |
392 | if (!pchip->pdata) | |
393 | return -ENOMEM; | |
394 | ret = lp8755_init_data(pchip); | |
240a5291 AL |
395 | if (ret < 0) { |
396 | dev_err(&client->dev, "fail to initialize chip\n"); | |
397 | return ret; | |
398 | } | |
b59320cc DJ |
399 | } |
400 | ||
401 | ret = lp8755_regulator_init(pchip); | |
240a5291 AL |
402 | if (ret < 0) { |
403 | dev_err(&client->dev, "fail to initialize regulators\n"); | |
57135250 | 404 | goto err; |
240a5291 | 405 | } |
b59320cc DJ |
406 | |
407 | pchip->irq = client->irq; | |
408 | ret = lp8755_int_config(pchip); | |
240a5291 AL |
409 | if (ret < 0) { |
410 | dev_err(&client->dev, "fail to irq config\n"); | |
57135250 | 411 | goto err; |
240a5291 | 412 | } |
b59320cc DJ |
413 | |
414 | return ret; | |
415 | ||
57135250 | 416 | err: |
b59320cc | 417 | /* output disable */ |
1200c60b | 418 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
4cf12735 | 419 | regmap_write(pchip->regmap, icnt, 0x00); |
b59320cc | 420 | |
b59320cc DJ |
421 | return ret; |
422 | } | |
423 | ||
ed5c2f5f | 424 | static void lp8755_remove(struct i2c_client *client) |
b59320cc DJ |
425 | { |
426 | int icnt; | |
427 | struct lp8755_chip *pchip = i2c_get_clientdata(client); | |
428 | ||
1200c60b | 429 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
4cf12735 | 430 | regmap_write(pchip->regmap, icnt, 0x00); |
b59320cc DJ |
431 | } |
432 | ||
433 | static const struct i2c_device_id lp8755_id[] = { | |
434 | {LP8755_NAME, 0}, | |
435 | {} | |
436 | }; | |
437 | ||
438 | MODULE_DEVICE_TABLE(i2c, lp8755_id); | |
439 | ||
440 | static struct i2c_driver lp8755_i2c_driver = { | |
441 | .driver = { | |
442 | .name = LP8755_NAME, | |
259b93b2 | 443 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
b59320cc | 444 | }, |
964e1865 | 445 | .probe = lp8755_probe, |
a1a41ab4 | 446 | .remove = lp8755_remove, |
b59320cc DJ |
447 | .id_table = lp8755_id, |
448 | }; | |
449 | ||
450 | static int __init lp8755_init(void) | |
451 | { | |
452 | return i2c_add_driver(&lp8755_i2c_driver); | |
453 | } | |
454 | ||
455 | subsys_initcall(lp8755_init); | |
456 | ||
457 | static void __exit lp8755_exit(void) | |
458 | { | |
459 | i2c_del_driver(&lp8755_i2c_driver); | |
460 | } | |
461 | ||
462 | module_exit(lp8755_exit); | |
463 | ||
464 | MODULE_DESCRIPTION("Texas Instruments lp8755 driver"); | |
465 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); | |
466 | MODULE_LICENSE("GPL v2"); |