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6219929f LD |
1 | /* |
2 | * tps62360.c -- TI tps62360 | |
3 | * | |
d1cf4f65 | 4 | * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363. |
6219929f LD |
5 | * |
6 | * Copyright (c) 2012, NVIDIA Corporation. | |
7 | * | |
8 | * Author: Laxman Dewangan <ldewangan@nvidia.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation version 2. | |
13 | * | |
14 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, | |
15 | * whether express or implied; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
22 | * 02111-1307, USA | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/platform_device.h> | |
30 | #include <linux/regulator/driver.h> | |
31 | #include <linux/regulator/machine.h> | |
32 | #include <linux/regulator/tps62360.h> | |
33 | #include <linux/gpio.h> | |
34 | #include <linux/i2c.h> | |
6219929f LD |
35 | #include <linux/slab.h> |
36 | #include <linux/regmap.h> | |
37 | ||
38 | /* Register definitions */ | |
39 | #define REG_VSET0 0 | |
40 | #define REG_VSET1 1 | |
41 | #define REG_VSET2 2 | |
42 | #define REG_VSET3 3 | |
43 | #define REG_CONTROL 4 | |
44 | #define REG_TEMP 5 | |
45 | #define REG_RAMPCTRL 6 | |
46 | #define REG_CHIPID 8 | |
47 | ||
d1cf4f65 | 48 | enum chips {TPS62360, TPS62361, TPS62362, TPS62363}; |
6219929f | 49 | |
2935fb18 | 50 | #define TPS62360_BASE_VOLTAGE 770000 |
6219929f LD |
51 | #define TPS62360_N_VOLTAGES 64 |
52 | ||
2935fb18 | 53 | #define TPS62361_BASE_VOLTAGE 500000 |
6219929f LD |
54 | #define TPS62361_N_VOLTAGES 128 |
55 | ||
56 | /* tps 62360 chip information */ | |
57 | struct tps62360_chip { | |
6219929f LD |
58 | struct device *dev; |
59 | struct regulator_desc desc; | |
6219929f LD |
60 | struct regulator_dev *rdev; |
61 | struct regmap *regmap; | |
62 | int chip_id; | |
63 | int vsel0_gpio; | |
64 | int vsel1_gpio; | |
65 | int voltage_base; | |
66 | u8 voltage_reg_mask; | |
67 | bool en_internal_pulldn; | |
68 | bool en_force_pwm; | |
69 | bool en_discharge; | |
70 | bool valid_gpios; | |
71 | int lru_index[4]; | |
72 | int curr_vset_vsel[4]; | |
73 | int curr_vset_id; | |
a60cfce0 | 74 | int change_uv_per_us; |
6219929f LD |
75 | }; |
76 | ||
77 | /* | |
78 | * find_voltage_set_register: Find new voltage configuration register | |
79 | * (VSET) id. | |
80 | * The finding of the new VSET register will be based on the LRU mechanism. | |
81 | * Each VSET register will have different voltage configured . This | |
82 | * Function will look if any of the VSET register have requested voltage set | |
83 | * or not. | |
84 | * - If it is already there then it will make that register as most | |
85 | * recently used and return as found so that caller need not to set | |
86 | * the VSET register but need to set the proper gpios to select this | |
87 | * VSET register. | |
88 | * - If requested voltage is not found then it will use the least | |
89 | * recently mechanism to get new VSET register for new configuration | |
90 | * and will return not_found so that caller need to set new VSET | |
91 | * register and then gpios (both). | |
92 | */ | |
93 | static bool find_voltage_set_register(struct tps62360_chip *tps, | |
94 | int req_vsel, int *vset_reg_id) | |
95 | { | |
96 | int i; | |
97 | bool found = false; | |
98 | int new_vset_reg = tps->lru_index[3]; | |
99 | int found_index = 3; | |
2935fb18 | 100 | |
6219929f LD |
101 | for (i = 0; i < 4; ++i) { |
102 | if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) { | |
103 | new_vset_reg = tps->lru_index[i]; | |
104 | found_index = i; | |
105 | found = true; | |
106 | goto update_lru_index; | |
107 | } | |
108 | } | |
109 | ||
110 | update_lru_index: | |
111 | for (i = found_index; i > 0; i--) | |
112 | tps->lru_index[i] = tps->lru_index[i - 1]; | |
113 | ||
114 | tps->lru_index[0] = new_vset_reg; | |
115 | *vset_reg_id = new_vset_reg; | |
116 | return found; | |
117 | } | |
118 | ||
a60cfce0 | 119 | static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev) |
6219929f LD |
120 | { |
121 | struct tps62360_chip *tps = rdev_get_drvdata(dev); | |
122 | int vsel; | |
123 | unsigned int data; | |
124 | int ret; | |
125 | ||
126 | ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data); | |
127 | if (ret < 0) { | |
2935fb18 LD |
128 | dev_err(tps->dev, "%s(): register %d read failed with err %d\n", |
129 | __func__, REG_VSET0 + tps->curr_vset_id, ret); | |
6219929f LD |
130 | return ret; |
131 | } | |
132 | vsel = (int)data & tps->voltage_reg_mask; | |
a60cfce0 | 133 | return vsel; |
6219929f LD |
134 | } |
135 | ||
136 | static int tps62360_dcdc_set_voltage(struct regulator_dev *dev, | |
137 | int min_uV, int max_uV, unsigned *selector) | |
138 | { | |
139 | struct tps62360_chip *tps = rdev_get_drvdata(dev); | |
140 | int vsel; | |
141 | int ret; | |
142 | bool found = false; | |
143 | int new_vset_id = tps->curr_vset_id; | |
144 | ||
2935fb18 | 145 | if ((max_uV < min_uV) || (max_uV < tps->voltage_base)) |
6219929f LD |
146 | return -EINVAL; |
147 | ||
2935fb18 | 148 | if (min_uV > (tps->voltage_base + (tps->desc.n_voltages - 1) * 10000)) |
6219929f LD |
149 | return -EINVAL; |
150 | ||
2935fb18 | 151 | vsel = DIV_ROUND_UP(min_uV - tps->voltage_base, 10000); |
6219929f LD |
152 | if (selector) |
153 | *selector = (vsel & tps->voltage_reg_mask); | |
154 | ||
155 | /* | |
156 | * If gpios are available to select the VSET register then least | |
157 | * recently used register for new configuration. | |
158 | */ | |
159 | if (tps->valid_gpios) | |
160 | found = find_voltage_set_register(tps, vsel, &new_vset_id); | |
161 | ||
162 | if (!found) { | |
163 | ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id, | |
164 | tps->voltage_reg_mask, vsel); | |
165 | if (ret < 0) { | |
2935fb18 LD |
166 | dev_err(tps->dev, |
167 | "%s(): register %d update failed with err %d\n", | |
168 | __func__, REG_VSET0 + new_vset_id, ret); | |
6219929f LD |
169 | return ret; |
170 | } | |
171 | tps->curr_vset_id = new_vset_id; | |
172 | tps->curr_vset_vsel[new_vset_id] = vsel; | |
173 | } | |
174 | ||
175 | /* Select proper VSET register vio gpios */ | |
176 | if (tps->valid_gpios) { | |
2935fb18 | 177 | gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1); |
6219929f LD |
178 | gpio_set_value_cansleep(tps->vsel1_gpio, |
179 | (new_vset_id >> 1) & 0x1); | |
180 | } | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int tps62360_dcdc_list_voltage(struct regulator_dev *dev, | |
185 | unsigned selector) | |
186 | { | |
187 | struct tps62360_chip *tps = rdev_get_drvdata(dev); | |
188 | ||
46783a04 | 189 | if (selector >= tps->desc.n_voltages) |
6219929f | 190 | return -EINVAL; |
2935fb18 LD |
191 | |
192 | return tps->voltage_base + selector * 10000; | |
6219929f LD |
193 | } |
194 | ||
a60cfce0 LD |
195 | static int tps62360_set_voltage_time_sel(struct regulator_dev *rdev, |
196 | unsigned int old_selector, unsigned int new_selector) | |
197 | { | |
198 | struct tps62360_chip *tps = rdev_get_drvdata(rdev); | |
199 | int old_uV, new_uV; | |
200 | ||
201 | old_uV = tps62360_dcdc_list_voltage(rdev, old_selector); | |
202 | if (old_uV < 0) | |
203 | return old_uV; | |
204 | ||
205 | new_uV = tps62360_dcdc_list_voltage(rdev, new_selector); | |
206 | if (new_uV < 0) | |
207 | return new_uV; | |
208 | ||
209 | return DIV_ROUND_UP(abs(old_uV - new_uV), tps->change_uv_per_us); | |
210 | } | |
211 | ||
6219929f | 212 | static struct regulator_ops tps62360_dcdc_ops = { |
a60cfce0 LD |
213 | .get_voltage_sel = tps62360_dcdc_get_voltage_sel, |
214 | .set_voltage = tps62360_dcdc_set_voltage, | |
215 | .list_voltage = tps62360_dcdc_list_voltage, | |
216 | .set_voltage_time_sel = tps62360_set_voltage_time_sel, | |
6219929f LD |
217 | }; |
218 | ||
2935fb18 | 219 | static int __devinit tps62360_init_force_pwm(struct tps62360_chip *tps, |
6219929f LD |
220 | struct tps62360_regulator_platform_data *pdata, |
221 | int vset_id) | |
222 | { | |
6219929f | 223 | int ret; |
2935fb18 LD |
224 | int bit = 0; |
225 | ||
6219929f | 226 | if (pdata->en_force_pwm) |
2935fb18 LD |
227 | bit = BIT(7); |
228 | ||
229 | ret = regmap_update_bits(tps->regmap, REG_VSET0 + vset_id, BIT(7), bit); | |
6219929f | 230 | if (ret < 0) |
2935fb18 LD |
231 | dev_err(tps->dev, |
232 | "%s(): register %d update failed with err %d\n", | |
233 | __func__, REG_VSET0 + vset_id, ret); | |
6219929f LD |
234 | return ret; |
235 | } | |
236 | ||
2935fb18 | 237 | static int __devinit tps62360_init_dcdc(struct tps62360_chip *tps, |
6219929f LD |
238 | struct tps62360_regulator_platform_data *pdata) |
239 | { | |
240 | int ret; | |
241 | int i; | |
a60cfce0 | 242 | unsigned int ramp_ctrl; |
6219929f | 243 | |
2935fb18 | 244 | /* Initialize internal pull up/down control */ |
6219929f LD |
245 | if (tps->en_internal_pulldn) |
246 | ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0); | |
247 | else | |
248 | ret = regmap_write(tps->regmap, REG_CONTROL, 0x0); | |
249 | if (ret < 0) { | |
2935fb18 LD |
250 | dev_err(tps->dev, |
251 | "%s(): register %d write failed with err %d\n", | |
252 | __func__, REG_CONTROL, ret); | |
6219929f LD |
253 | return ret; |
254 | } | |
255 | ||
2935fb18 | 256 | /* Initialize force PWM mode */ |
6219929f LD |
257 | if (tps->valid_gpios) { |
258 | for (i = 0; i < 4; ++i) { | |
259 | ret = tps62360_init_force_pwm(tps, pdata, i); | |
260 | if (ret < 0) | |
261 | return ret; | |
262 | } | |
263 | } else { | |
264 | ret = tps62360_init_force_pwm(tps, pdata, tps->curr_vset_id); | |
265 | if (ret < 0) | |
266 | return ret; | |
267 | } | |
268 | ||
269 | /* Reset output discharge path to reduce power consumption */ | |
270 | ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0); | |
a60cfce0 | 271 | if (ret < 0) { |
2935fb18 LD |
272 | dev_err(tps->dev, |
273 | "%s(): register %d update failed with err %d\n", | |
274 | __func__, REG_RAMPCTRL, ret); | |
a60cfce0 LD |
275 | return ret; |
276 | } | |
277 | ||
278 | /* Get ramp value from ramp control register */ | |
279 | ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl); | |
280 | if (ret < 0) { | |
2935fb18 LD |
281 | dev_err(tps->dev, |
282 | "%s(): register %d read failed with err %d\n", | |
283 | __func__, REG_RAMPCTRL, ret); | |
a60cfce0 LD |
284 | return ret; |
285 | } | |
286 | ramp_ctrl = (ramp_ctrl >> 4) & 0x7; | |
287 | ||
288 | /* ramp mV/us = 32/(2^ramp_ctrl) */ | |
289 | tps->change_uv_per_us = DIV_ROUND_UP(32000, BIT(ramp_ctrl)); | |
6219929f LD |
290 | return ret; |
291 | } | |
292 | ||
293 | static const struct regmap_config tps62360_regmap_config = { | |
16ea003b LD |
294 | .reg_bits = 8, |
295 | .val_bits = 8, | |
296 | .max_register = REG_CHIPID, | |
297 | .cache_type = REGCACHE_RBTREE, | |
6219929f LD |
298 | }; |
299 | ||
300 | static int __devinit tps62360_probe(struct i2c_client *client, | |
301 | const struct i2c_device_id *id) | |
302 | { | |
c172708d | 303 | struct regulator_config config = { }; |
6219929f LD |
304 | struct tps62360_regulator_platform_data *pdata; |
305 | struct regulator_dev *rdev; | |
306 | struct tps62360_chip *tps; | |
307 | int ret; | |
308 | int i; | |
309 | ||
310 | pdata = client->dev.platform_data; | |
311 | if (!pdata) { | |
2935fb18 | 312 | dev_err(&client->dev, "%s(): Platform data not found\n", |
6219929f LD |
313 | __func__); |
314 | return -EIO; | |
315 | } | |
316 | ||
317 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); | |
318 | if (!tps) { | |
2935fb18 | 319 | dev_err(&client->dev, "%s(): Memory allocation failed\n", |
6219929f LD |
320 | __func__); |
321 | return -ENOMEM; | |
322 | } | |
323 | ||
324 | tps->en_force_pwm = pdata->en_force_pwm; | |
325 | tps->en_discharge = pdata->en_discharge; | |
326 | tps->en_internal_pulldn = pdata->en_internal_pulldn; | |
327 | tps->vsel0_gpio = pdata->vsel0_gpio; | |
328 | tps->vsel1_gpio = pdata->vsel1_gpio; | |
6219929f | 329 | tps->dev = &client->dev; |
d1cf4f65 AL |
330 | |
331 | switch (id->driver_data) { | |
332 | case TPS62360: | |
333 | case TPS62362: | |
334 | tps->voltage_base = TPS62360_BASE_VOLTAGE; | |
335 | tps->voltage_reg_mask = 0x3F; | |
336 | tps->desc.n_voltages = TPS62360_N_VOLTAGES; | |
337 | break; | |
338 | case TPS62361: | |
339 | case TPS62363: | |
340 | tps->voltage_base = TPS62361_BASE_VOLTAGE; | |
341 | tps->voltage_reg_mask = 0x7F; | |
342 | tps->desc.n_voltages = TPS62361_N_VOLTAGES; | |
343 | break; | |
344 | default: | |
345 | return -ENODEV; | |
346 | } | |
6219929f LD |
347 | |
348 | tps->desc.name = id->name; | |
349 | tps->desc.id = 0; | |
6219929f LD |
350 | tps->desc.ops = &tps62360_dcdc_ops; |
351 | tps->desc.type = REGULATOR_VOLTAGE; | |
352 | tps->desc.owner = THIS_MODULE; | |
9a4bdd87 | 353 | tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config); |
6219929f LD |
354 | if (IS_ERR(tps->regmap)) { |
355 | ret = PTR_ERR(tps->regmap); | |
2935fb18 LD |
356 | dev_err(&client->dev, |
357 | "%s(): regmap allocation failed with err %d\n", | |
358 | __func__, ret); | |
6219929f LD |
359 | return ret; |
360 | } | |
361 | i2c_set_clientdata(client, tps); | |
362 | ||
363 | tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 + | |
364 | (pdata->vsel0_def_state & 1); | |
365 | tps->lru_index[0] = tps->curr_vset_id; | |
366 | tps->valid_gpios = false; | |
367 | ||
368 | if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) { | |
2935fb18 LD |
369 | int gpio_flags; |
370 | gpio_flags = (pdata->vsel0_def_state) ? | |
371 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; | |
372 | ret = gpio_request_one(tps->vsel0_gpio, | |
373 | gpio_flags, "tps62360-vsel0"); | |
6219929f LD |
374 | if (ret) { |
375 | dev_err(&client->dev, | |
2935fb18 LD |
376 | "%s(): Could not obtain vsel0 GPIO %d: %d\n", |
377 | __func__, tps->vsel0_gpio, ret); | |
6219929f LD |
378 | goto err_gpio0; |
379 | } | |
380 | ||
2935fb18 LD |
381 | gpio_flags = (pdata->vsel1_def_state) ? |
382 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; | |
383 | ret = gpio_request_one(tps->vsel1_gpio, | |
384 | gpio_flags, "tps62360-vsel1"); | |
6219929f LD |
385 | if (ret) { |
386 | dev_err(&client->dev, | |
2935fb18 LD |
387 | "%s(): Could not obtain vsel1 GPIO %d: %d\n", |
388 | __func__, tps->vsel1_gpio, ret); | |
6219929f LD |
389 | goto err_gpio1; |
390 | } | |
391 | tps->valid_gpios = true; | |
392 | ||
393 | /* | |
394 | * Initialize the lru index with vset_reg id | |
395 | * The index 0 will be most recently used and | |
396 | * set with the tps->curr_vset_id */ | |
397 | for (i = 0; i < 4; ++i) | |
398 | tps->lru_index[i] = i; | |
399 | tps->lru_index[0] = tps->curr_vset_id; | |
400 | tps->lru_index[tps->curr_vset_id] = 0; | |
401 | } | |
402 | ||
403 | ret = tps62360_init_dcdc(tps, pdata); | |
404 | if (ret < 0) { | |
2935fb18 | 405 | dev_err(tps->dev, "%s(): Init failed with err = %d\n", |
6219929f LD |
406 | __func__, ret); |
407 | goto err_init; | |
408 | } | |
409 | ||
c172708d MB |
410 | config.dev = &client->dev; |
411 | config.init_data = &pdata->reg_init_data; | |
412 | config.driver_data = tps; | |
413 | ||
6219929f | 414 | /* Register the regulators */ |
c172708d | 415 | rdev = regulator_register(&tps->desc, &config); |
6219929f | 416 | if (IS_ERR(rdev)) { |
2935fb18 LD |
417 | dev_err(tps->dev, |
418 | "%s(): regulator register failed with err %s\n", | |
419 | __func__, id->name); | |
6219929f LD |
420 | ret = PTR_ERR(rdev); |
421 | goto err_init; | |
422 | } | |
423 | ||
424 | tps->rdev = rdev; | |
425 | return 0; | |
426 | ||
427 | err_init: | |
428 | if (gpio_is_valid(tps->vsel1_gpio)) | |
429 | gpio_free(tps->vsel1_gpio); | |
430 | err_gpio1: | |
431 | if (gpio_is_valid(tps->vsel0_gpio)) | |
432 | gpio_free(tps->vsel0_gpio); | |
433 | err_gpio0: | |
6219929f LD |
434 | return ret; |
435 | } | |
436 | ||
437 | /** | |
438 | * tps62360_remove - tps62360 driver i2c remove handler | |
439 | * @client: i2c driver client device structure | |
440 | * | |
441 | * Unregister TPS driver as an i2c client device driver | |
442 | */ | |
443 | static int __devexit tps62360_remove(struct i2c_client *client) | |
444 | { | |
445 | struct tps62360_chip *tps = i2c_get_clientdata(client); | |
446 | ||
447 | if (gpio_is_valid(tps->vsel1_gpio)) | |
448 | gpio_free(tps->vsel1_gpio); | |
449 | ||
450 | if (gpio_is_valid(tps->vsel0_gpio)) | |
451 | gpio_free(tps->vsel0_gpio); | |
452 | ||
453 | regulator_unregister(tps->rdev); | |
6219929f LD |
454 | return 0; |
455 | } | |
456 | ||
457 | static void tps62360_shutdown(struct i2c_client *client) | |
458 | { | |
459 | struct tps62360_chip *tps = i2c_get_clientdata(client); | |
460 | int st; | |
461 | ||
462 | if (!tps->en_discharge) | |
463 | return; | |
464 | ||
465 | /* Configure the output discharge path */ | |
466 | st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2)); | |
467 | if (st < 0) | |
2935fb18 LD |
468 | dev_err(tps->dev, |
469 | "%s(): register %d update failed with err %d\n", | |
470 | __func__, REG_RAMPCTRL, st); | |
6219929f LD |
471 | } |
472 | ||
473 | static const struct i2c_device_id tps62360_id[] = { | |
474 | {.name = "tps62360", .driver_data = TPS62360}, | |
475 | {.name = "tps62361", .driver_data = TPS62361}, | |
d1cf4f65 AL |
476 | {.name = "tps62362", .driver_data = TPS62362}, |
477 | {.name = "tps62363", .driver_data = TPS62363}, | |
6219929f LD |
478 | {}, |
479 | }; | |
480 | ||
481 | MODULE_DEVICE_TABLE(i2c, tps62360_id); | |
482 | ||
483 | static struct i2c_driver tps62360_i2c_driver = { | |
484 | .driver = { | |
485 | .name = "tps62360", | |
486 | .owner = THIS_MODULE, | |
487 | }, | |
488 | .probe = tps62360_probe, | |
489 | .remove = __devexit_p(tps62360_remove), | |
490 | .shutdown = tps62360_shutdown, | |
491 | .id_table = tps62360_id, | |
492 | }; | |
493 | ||
494 | static int __init tps62360_init(void) | |
495 | { | |
496 | return i2c_add_driver(&tps62360_i2c_driver); | |
497 | } | |
498 | subsys_initcall(tps62360_init); | |
499 | ||
500 | static void __exit tps62360_cleanup(void) | |
501 | { | |
502 | i2c_del_driver(&tps62360_i2c_driver); | |
503 | } | |
504 | module_exit(tps62360_cleanup); | |
505 | ||
506 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
d1cf4f65 | 507 | MODULE_DESCRIPTION("TPS6236x voltage regulator driver"); |
6219929f | 508 | MODULE_LICENSE("GPL v2"); |