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6219929f LD |
1 | /* |
2 | * tps62360.c -- TI tps62360 | |
3 | * | |
4 | * Driver for processor core supply tps62360 and tps62361B | |
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> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/regmap.h> | |
38 | ||
39 | /* Register definitions */ | |
40 | #define REG_VSET0 0 | |
41 | #define REG_VSET1 1 | |
42 | #define REG_VSET2 2 | |
43 | #define REG_VSET3 3 | |
44 | #define REG_CONTROL 4 | |
45 | #define REG_TEMP 5 | |
46 | #define REG_RAMPCTRL 6 | |
47 | #define REG_CHIPID 8 | |
48 | ||
49 | enum chips {TPS62360, TPS62361}; | |
50 | ||
51 | #define TPS62360_BASE_VOLTAGE 770 | |
52 | #define TPS62360_N_VOLTAGES 64 | |
53 | ||
54 | #define TPS62361_BASE_VOLTAGE 500 | |
55 | #define TPS62361_N_VOLTAGES 128 | |
56 | ||
57 | /* tps 62360 chip information */ | |
58 | struct tps62360_chip { | |
59 | const char *name; | |
60 | struct device *dev; | |
61 | struct regulator_desc desc; | |
62 | struct i2c_client *client; | |
63 | struct regulator_dev *rdev; | |
64 | struct regmap *regmap; | |
65 | int chip_id; | |
66 | int vsel0_gpio; | |
67 | int vsel1_gpio; | |
68 | int voltage_base; | |
69 | u8 voltage_reg_mask; | |
70 | bool en_internal_pulldn; | |
71 | bool en_force_pwm; | |
72 | bool en_discharge; | |
73 | bool valid_gpios; | |
74 | int lru_index[4]; | |
75 | int curr_vset_vsel[4]; | |
76 | int curr_vset_id; | |
77 | }; | |
78 | ||
79 | /* | |
80 | * find_voltage_set_register: Find new voltage configuration register | |
81 | * (VSET) id. | |
82 | * The finding of the new VSET register will be based on the LRU mechanism. | |
83 | * Each VSET register will have different voltage configured . This | |
84 | * Function will look if any of the VSET register have requested voltage set | |
85 | * or not. | |
86 | * - If it is already there then it will make that register as most | |
87 | * recently used and return as found so that caller need not to set | |
88 | * the VSET register but need to set the proper gpios to select this | |
89 | * VSET register. | |
90 | * - If requested voltage is not found then it will use the least | |
91 | * recently mechanism to get new VSET register for new configuration | |
92 | * and will return not_found so that caller need to set new VSET | |
93 | * register and then gpios (both). | |
94 | */ | |
95 | static bool find_voltage_set_register(struct tps62360_chip *tps, | |
96 | int req_vsel, int *vset_reg_id) | |
97 | { | |
98 | int i; | |
99 | bool found = false; | |
100 | int new_vset_reg = tps->lru_index[3]; | |
101 | int found_index = 3; | |
102 | for (i = 0; i < 4; ++i) { | |
103 | if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) { | |
104 | new_vset_reg = tps->lru_index[i]; | |
105 | found_index = i; | |
106 | found = true; | |
107 | goto update_lru_index; | |
108 | } | |
109 | } | |
110 | ||
111 | update_lru_index: | |
112 | for (i = found_index; i > 0; i--) | |
113 | tps->lru_index[i] = tps->lru_index[i - 1]; | |
114 | ||
115 | tps->lru_index[0] = new_vset_reg; | |
116 | *vset_reg_id = new_vset_reg; | |
117 | return found; | |
118 | } | |
119 | ||
120 | static int tps62360_dcdc_get_voltage(struct regulator_dev *dev) | |
121 | { | |
122 | struct tps62360_chip *tps = rdev_get_drvdata(dev); | |
123 | int vsel; | |
124 | unsigned int data; | |
125 | int ret; | |
126 | ||
127 | ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data); | |
128 | if (ret < 0) { | |
129 | dev_err(tps->dev, "%s: Error in reading register %d\n", | |
130 | __func__, REG_VSET0 + tps->curr_vset_id); | |
131 | return ret; | |
132 | } | |
133 | vsel = (int)data & tps->voltage_reg_mask; | |
134 | return (tps->voltage_base + vsel * 10) * 1000; | |
135 | } | |
136 | ||
137 | static int tps62360_dcdc_set_voltage(struct regulator_dev *dev, | |
138 | int min_uV, int max_uV, unsigned *selector) | |
139 | { | |
140 | struct tps62360_chip *tps = rdev_get_drvdata(dev); | |
141 | int vsel; | |
142 | int ret; | |
143 | bool found = false; | |
144 | int new_vset_id = tps->curr_vset_id; | |
145 | ||
146 | if (max_uV < min_uV) | |
147 | return -EINVAL; | |
148 | ||
149 | if (min_uV > | |
150 | ((tps->voltage_base + (tps->desc.n_voltages - 1) * 10) * 1000)) | |
151 | return -EINVAL; | |
152 | ||
153 | if (max_uV < tps->voltage_base * 1000) | |
154 | return -EINVAL; | |
155 | ||
156 | vsel = DIV_ROUND_UP(min_uV - (tps->voltage_base * 1000), 10000); | |
157 | if (selector) | |
158 | *selector = (vsel & tps->voltage_reg_mask); | |
159 | ||
160 | /* | |
161 | * If gpios are available to select the VSET register then least | |
162 | * recently used register for new configuration. | |
163 | */ | |
164 | if (tps->valid_gpios) | |
165 | found = find_voltage_set_register(tps, vsel, &new_vset_id); | |
166 | ||
167 | if (!found) { | |
168 | ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id, | |
169 | tps->voltage_reg_mask, vsel); | |
170 | if (ret < 0) { | |
171 | dev_err(tps->dev, "%s: Error in updating register %d\n", | |
172 | __func__, REG_VSET0 + new_vset_id); | |
173 | return ret; | |
174 | } | |
175 | tps->curr_vset_id = new_vset_id; | |
176 | tps->curr_vset_vsel[new_vset_id] = vsel; | |
177 | } | |
178 | ||
179 | /* Select proper VSET register vio gpios */ | |
180 | if (tps->valid_gpios) { | |
181 | gpio_set_value_cansleep(tps->vsel0_gpio, | |
182 | new_vset_id & 0x1); | |
183 | gpio_set_value_cansleep(tps->vsel1_gpio, | |
184 | (new_vset_id >> 1) & 0x1); | |
185 | } | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static int tps62360_dcdc_list_voltage(struct regulator_dev *dev, | |
190 | unsigned selector) | |
191 | { | |
192 | struct tps62360_chip *tps = rdev_get_drvdata(dev); | |
193 | ||
46783a04 | 194 | if (selector >= tps->desc.n_voltages) |
6219929f LD |
195 | return -EINVAL; |
196 | return (tps->voltage_base + selector * 10) * 1000; | |
197 | } | |
198 | ||
199 | static struct regulator_ops tps62360_dcdc_ops = { | |
200 | .get_voltage = tps62360_dcdc_get_voltage, | |
201 | .set_voltage = tps62360_dcdc_set_voltage, | |
202 | .list_voltage = tps62360_dcdc_list_voltage, | |
203 | }; | |
204 | ||
205 | static int tps62360_init_force_pwm(struct tps62360_chip *tps, | |
206 | struct tps62360_regulator_platform_data *pdata, | |
207 | int vset_id) | |
208 | { | |
209 | unsigned int data; | |
210 | int ret; | |
211 | ret = regmap_read(tps->regmap, REG_VSET0 + vset_id, &data); | |
212 | if (ret < 0) { | |
213 | dev_err(tps->dev, "%s() fails in writing reg %d\n", | |
214 | __func__, REG_VSET0 + vset_id); | |
215 | return ret; | |
216 | } | |
217 | tps->curr_vset_vsel[vset_id] = data & tps->voltage_reg_mask; | |
218 | if (pdata->en_force_pwm) | |
219 | data |= BIT(7); | |
220 | else | |
221 | data &= ~BIT(7); | |
222 | ret = regmap_write(tps->regmap, REG_VSET0 + vset_id, data); | |
223 | if (ret < 0) | |
224 | dev_err(tps->dev, "%s() fails in writing reg %d\n", | |
225 | __func__, REG_VSET0 + vset_id); | |
226 | return ret; | |
227 | } | |
228 | ||
229 | static int tps62360_init_dcdc(struct tps62360_chip *tps, | |
230 | struct tps62360_regulator_platform_data *pdata) | |
231 | { | |
232 | int ret; | |
233 | int i; | |
234 | ||
235 | /* Initailize internal pull up/down control */ | |
236 | if (tps->en_internal_pulldn) | |
237 | ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0); | |
238 | else | |
239 | ret = regmap_write(tps->regmap, REG_CONTROL, 0x0); | |
240 | if (ret < 0) { | |
241 | dev_err(tps->dev, "%s() fails in writing reg %d\n", | |
242 | __func__, REG_CONTROL); | |
243 | return ret; | |
244 | } | |
245 | ||
246 | /* Initailize force PWM mode */ | |
247 | if (tps->valid_gpios) { | |
248 | for (i = 0; i < 4; ++i) { | |
249 | ret = tps62360_init_force_pwm(tps, pdata, i); | |
250 | if (ret < 0) | |
251 | return ret; | |
252 | } | |
253 | } else { | |
254 | ret = tps62360_init_force_pwm(tps, pdata, tps->curr_vset_id); | |
255 | if (ret < 0) | |
256 | return ret; | |
257 | } | |
258 | ||
259 | /* Reset output discharge path to reduce power consumption */ | |
260 | ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0); | |
261 | if (ret < 0) | |
262 | dev_err(tps->dev, "%s() fails in updating reg %d\n", | |
263 | __func__, REG_RAMPCTRL); | |
264 | return ret; | |
265 | } | |
266 | ||
267 | static const struct regmap_config tps62360_regmap_config = { | |
268 | .reg_bits = 8, | |
269 | .val_bits = 8, | |
270 | }; | |
271 | ||
272 | static int __devinit tps62360_probe(struct i2c_client *client, | |
273 | const struct i2c_device_id *id) | |
274 | { | |
275 | struct tps62360_regulator_platform_data *pdata; | |
276 | struct regulator_dev *rdev; | |
277 | struct tps62360_chip *tps; | |
278 | int ret; | |
279 | int i; | |
280 | ||
281 | pdata = client->dev.platform_data; | |
282 | if (!pdata) { | |
283 | dev_err(&client->dev, "%s() Err: Platform data not found\n", | |
284 | __func__); | |
285 | return -EIO; | |
286 | } | |
287 | ||
288 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); | |
289 | if (!tps) { | |
290 | dev_err(&client->dev, "%s() Err: Memory allocation fails\n", | |
291 | __func__); | |
292 | return -ENOMEM; | |
293 | } | |
294 | ||
295 | tps->en_force_pwm = pdata->en_force_pwm; | |
296 | tps->en_discharge = pdata->en_discharge; | |
297 | tps->en_internal_pulldn = pdata->en_internal_pulldn; | |
298 | tps->vsel0_gpio = pdata->vsel0_gpio; | |
299 | tps->vsel1_gpio = pdata->vsel1_gpio; | |
300 | tps->client = client; | |
301 | tps->dev = &client->dev; | |
302 | tps->name = id->name; | |
303 | tps->voltage_base = (id->driver_data == TPS62360) ? | |
304 | TPS62360_BASE_VOLTAGE : TPS62361_BASE_VOLTAGE; | |
305 | tps->voltage_reg_mask = (id->driver_data == TPS62360) ? 0x3F : 0x7F; | |
306 | ||
307 | tps->desc.name = id->name; | |
308 | tps->desc.id = 0; | |
309 | tps->desc.n_voltages = (id->driver_data == TPS62360) ? | |
310 | TPS62360_N_VOLTAGES : TPS62361_N_VOLTAGES; | |
311 | tps->desc.ops = &tps62360_dcdc_ops; | |
312 | tps->desc.type = REGULATOR_VOLTAGE; | |
313 | tps->desc.owner = THIS_MODULE; | |
314 | tps->regmap = regmap_init_i2c(client, &tps62360_regmap_config); | |
315 | if (IS_ERR(tps->regmap)) { | |
316 | ret = PTR_ERR(tps->regmap); | |
317 | dev_err(&client->dev, "%s() Err: Failed to allocate register" | |
318 | "map: %d\n", __func__, ret); | |
319 | return ret; | |
320 | } | |
321 | i2c_set_clientdata(client, tps); | |
322 | ||
323 | tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 + | |
324 | (pdata->vsel0_def_state & 1); | |
325 | tps->lru_index[0] = tps->curr_vset_id; | |
326 | tps->valid_gpios = false; | |
327 | ||
328 | if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) { | |
329 | ret = gpio_request(tps->vsel0_gpio, "tps62360-vsel0"); | |
330 | if (ret) { | |
331 | dev_err(&client->dev, | |
332 | "Err: Could not obtain vsel0 GPIO %d: %d\n", | |
333 | tps->vsel0_gpio, ret); | |
334 | goto err_gpio0; | |
335 | } | |
336 | ret = gpio_direction_output(tps->vsel0_gpio, | |
337 | pdata->vsel0_def_state); | |
338 | if (ret) { | |
339 | dev_err(&client->dev, "Err: Could not set direction of" | |
340 | "vsel0 GPIO %d: %d\n", tps->vsel0_gpio, ret); | |
341 | gpio_free(tps->vsel0_gpio); | |
342 | goto err_gpio0; | |
343 | } | |
344 | ||
345 | ret = gpio_request(tps->vsel1_gpio, "tps62360-vsel1"); | |
346 | if (ret) { | |
347 | dev_err(&client->dev, | |
348 | "Err: Could not obtain vsel1 GPIO %d: %d\n", | |
349 | tps->vsel1_gpio, ret); | |
350 | goto err_gpio1; | |
351 | } | |
352 | ret = gpio_direction_output(tps->vsel1_gpio, | |
353 | pdata->vsel1_def_state); | |
354 | if (ret) { | |
355 | dev_err(&client->dev, "Err: Could not set direction of" | |
356 | "vsel1 GPIO %d: %d\n", tps->vsel1_gpio, ret); | |
357 | gpio_free(tps->vsel1_gpio); | |
358 | goto err_gpio1; | |
359 | } | |
360 | tps->valid_gpios = true; | |
361 | ||
362 | /* | |
363 | * Initialize the lru index with vset_reg id | |
364 | * The index 0 will be most recently used and | |
365 | * set with the tps->curr_vset_id */ | |
366 | for (i = 0; i < 4; ++i) | |
367 | tps->lru_index[i] = i; | |
368 | tps->lru_index[0] = tps->curr_vset_id; | |
369 | tps->lru_index[tps->curr_vset_id] = 0; | |
370 | } | |
371 | ||
372 | ret = tps62360_init_dcdc(tps, pdata); | |
373 | if (ret < 0) { | |
374 | dev_err(tps->dev, "%s() Err: Init fails with = %d\n", | |
375 | __func__, ret); | |
376 | goto err_init; | |
377 | } | |
378 | ||
379 | /* Register the regulators */ | |
380 | rdev = regulator_register(&tps->desc, &client->dev, | |
381 | &pdata->reg_init_data, tps, NULL); | |
382 | if (IS_ERR(rdev)) { | |
383 | dev_err(tps->dev, "%s() Err: Failed to register %s\n", | |
384 | __func__, id->name); | |
385 | ret = PTR_ERR(rdev); | |
386 | goto err_init; | |
387 | } | |
388 | ||
389 | tps->rdev = rdev; | |
390 | return 0; | |
391 | ||
392 | err_init: | |
393 | if (gpio_is_valid(tps->vsel1_gpio)) | |
394 | gpio_free(tps->vsel1_gpio); | |
395 | err_gpio1: | |
396 | if (gpio_is_valid(tps->vsel0_gpio)) | |
397 | gpio_free(tps->vsel0_gpio); | |
398 | err_gpio0: | |
399 | regmap_exit(tps->regmap); | |
400 | return ret; | |
401 | } | |
402 | ||
403 | /** | |
404 | * tps62360_remove - tps62360 driver i2c remove handler | |
405 | * @client: i2c driver client device structure | |
406 | * | |
407 | * Unregister TPS driver as an i2c client device driver | |
408 | */ | |
409 | static int __devexit tps62360_remove(struct i2c_client *client) | |
410 | { | |
411 | struct tps62360_chip *tps = i2c_get_clientdata(client); | |
412 | ||
413 | if (gpio_is_valid(tps->vsel1_gpio)) | |
414 | gpio_free(tps->vsel1_gpio); | |
415 | ||
416 | if (gpio_is_valid(tps->vsel0_gpio)) | |
417 | gpio_free(tps->vsel0_gpio); | |
418 | ||
419 | regulator_unregister(tps->rdev); | |
420 | regmap_exit(tps->regmap); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | static void tps62360_shutdown(struct i2c_client *client) | |
425 | { | |
426 | struct tps62360_chip *tps = i2c_get_clientdata(client); | |
427 | int st; | |
428 | ||
429 | if (!tps->en_discharge) | |
430 | return; | |
431 | ||
432 | /* Configure the output discharge path */ | |
433 | st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2)); | |
434 | if (st < 0) | |
435 | dev_err(tps->dev, "%s() fails in updating reg %d\n", | |
436 | __func__, REG_RAMPCTRL); | |
437 | } | |
438 | ||
439 | static const struct i2c_device_id tps62360_id[] = { | |
440 | {.name = "tps62360", .driver_data = TPS62360}, | |
441 | {.name = "tps62361", .driver_data = TPS62361}, | |
442 | {}, | |
443 | }; | |
444 | ||
445 | MODULE_DEVICE_TABLE(i2c, tps62360_id); | |
446 | ||
447 | static struct i2c_driver tps62360_i2c_driver = { | |
448 | .driver = { | |
449 | .name = "tps62360", | |
450 | .owner = THIS_MODULE, | |
451 | }, | |
452 | .probe = tps62360_probe, | |
453 | .remove = __devexit_p(tps62360_remove), | |
454 | .shutdown = tps62360_shutdown, | |
455 | .id_table = tps62360_id, | |
456 | }; | |
457 | ||
458 | static int __init tps62360_init(void) | |
459 | { | |
460 | return i2c_add_driver(&tps62360_i2c_driver); | |
461 | } | |
462 | subsys_initcall(tps62360_init); | |
463 | ||
464 | static void __exit tps62360_cleanup(void) | |
465 | { | |
466 | i2c_del_driver(&tps62360_i2c_driver); | |
467 | } | |
468 | module_exit(tps62360_cleanup); | |
469 | ||
470 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
471 | MODULE_DESCRIPTION("TPS62360 voltage regulator driver"); | |
472 | MODULE_LICENSE("GPL v2"); |