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5928f538 LD |
1 | /* |
2 | * max8973-regulator.c -- Maxim max8973 | |
3 | * | |
4 | * Regulator driver for MAXIM 8973 DC-DC step-down switching regulator. | |
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> | |
42dc3023 | 29 | #include <linux/of.h> |
0f7d6ece | 30 | #include <linux/of_device.h> |
5928f538 LD |
31 | #include <linux/platform_device.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
34 | #include <linux/regulator/max8973-regulator.h> | |
42dc3023 | 35 | #include <linux/regulator/of_regulator.h> |
5928f538 | 36 | #include <linux/gpio.h> |
e7d2be69 | 37 | #include <linux/gpio/consumer.h> |
c2ffa973 | 38 | #include <linux/of_gpio.h> |
5928f538 LD |
39 | #include <linux/i2c.h> |
40 | #include <linux/slab.h> | |
41 | #include <linux/regmap.h> | |
d2d5437b LD |
42 | #include <linux/thermal.h> |
43 | #include <linux/irq.h> | |
44 | #include <linux/interrupt.h> | |
5928f538 LD |
45 | |
46 | /* Register definitions */ | |
47 | #define MAX8973_VOUT 0x0 | |
48 | #define MAX8973_VOUT_DVS 0x1 | |
49 | #define MAX8973_CONTROL1 0x2 | |
50 | #define MAX8973_CONTROL2 0x3 | |
51 | #define MAX8973_CHIPID1 0x4 | |
52 | #define MAX8973_CHIPID2 0x5 | |
53 | ||
54 | #define MAX8973_MAX_VOUT_REG 2 | |
55 | ||
56 | /* MAX8973_VOUT */ | |
57 | #define MAX8973_VOUT_ENABLE BIT(7) | |
58 | #define MAX8973_VOUT_MASK 0x7F | |
59 | ||
60 | /* MAX8973_VOUT_DVS */ | |
61 | #define MAX8973_DVS_VOUT_MASK 0x7F | |
62 | ||
63 | /* MAX8973_CONTROL1 */ | |
64 | #define MAX8973_SNS_ENABLE BIT(7) | |
65 | #define MAX8973_FPWM_EN_M BIT(6) | |
66 | #define MAX8973_NFSR_ENABLE BIT(5) | |
67 | #define MAX8973_AD_ENABLE BIT(4) | |
68 | #define MAX8973_BIAS_ENABLE BIT(3) | |
69 | #define MAX8973_FREQSHIFT_9PER BIT(2) | |
70 | ||
71 | #define MAX8973_RAMP_12mV_PER_US 0x0 | |
72 | #define MAX8973_RAMP_25mV_PER_US 0x1 | |
73 | #define MAX8973_RAMP_50mV_PER_US 0x2 | |
74 | #define MAX8973_RAMP_200mV_PER_US 0x3 | |
3064c1f3 | 75 | #define MAX8973_RAMP_MASK 0x3 |
5928f538 LD |
76 | |
77 | /* MAX8973_CONTROL2 */ | |
78 | #define MAX8973_WDTMR_ENABLE BIT(6) | |
79 | #define MAX8973_DISCH_ENBABLE BIT(5) | |
80 | #define MAX8973_FT_ENABLE BIT(4) | |
d2d5437b | 81 | #define MAX77621_T_JUNCTION_120 BIT(7) |
5928f538 | 82 | |
ffaab991 | 83 | #define MAX8973_CKKADV_TRIP_MASK 0xC |
5928f538 LD |
84 | #define MAX8973_CKKADV_TRIP_DISABLE 0xC |
85 | #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 | |
86 | #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 | |
87 | #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 | |
88 | #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 | |
89 | ||
90 | #define MAX8973_INDUCTOR_MIN_30_PER 0x0 | |
91 | #define MAX8973_INDUCTOR_NOMINAL 0x1 | |
92 | #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 | |
93 | #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 | |
94 | #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 | |
95 | ||
96 | #define MAX8973_MIN_VOLATGE 606250 | |
97 | #define MAX8973_MAX_VOLATGE 1400000 | |
98 | #define MAX8973_VOLATGE_STEP 6250 | |
99 | #define MAX8973_BUCK_N_VOLTAGE 0x80 | |
100 | ||
d2d5437b LD |
101 | #define MAX77621_CHIPID_TJINT_S BIT(0) |
102 | ||
103 | #define MAX77621_NORMAL_OPERATING_TEMP 100000 | |
104 | #define MAX77621_TJINT_WARNING_TEMP_120 120000 | |
105 | #define MAX77621_TJINT_WARNING_TEMP_140 140000 | |
106 | ||
0f7d6ece LD |
107 | enum device_id { |
108 | MAX8973, | |
109 | MAX77621 | |
110 | }; | |
111 | ||
5928f538 LD |
112 | /* Maxim 8973 chip information */ |
113 | struct max8973_chip { | |
114 | struct device *dev; | |
115 | struct regulator_desc desc; | |
5928f538 LD |
116 | struct regmap *regmap; |
117 | bool enable_external_control; | |
118 | int dvs_gpio; | |
119 | int lru_index[MAX8973_MAX_VOUT_REG]; | |
120 | int curr_vout_val[MAX8973_MAX_VOUT_REG]; | |
121 | int curr_vout_reg; | |
122 | int curr_gpio_val; | |
db892ff6 | 123 | struct regulator_ops ops; |
0f7d6ece | 124 | enum device_id id; |
d2d5437b LD |
125 | int junction_temp_warning; |
126 | int irq; | |
127 | struct thermal_zone_device *tz_device; | |
5928f538 LD |
128 | }; |
129 | ||
130 | /* | |
131 | * find_voltage_set_register: Find new voltage configuration register (VOUT). | |
132 | * The finding of the new VOUT register will be based on the LRU mechanism. | |
133 | * Each VOUT register will have different voltage configured . This | |
134 | * Function will look if any of the VOUT register have requested voltage set | |
135 | * or not. | |
136 | * - If it is already there then it will make that register as most | |
137 | * recently used and return as found so that caller need not to set | |
138 | * the VOUT register but need to set the proper gpios to select this | |
139 | * VOUT register. | |
140 | * - If requested voltage is not found then it will use the least | |
141 | * recently mechanism to get new VOUT register for new configuration | |
142 | * and will return not_found so that caller need to set new VOUT | |
143 | * register and then gpios (both). | |
144 | */ | |
145 | static bool find_voltage_set_register(struct max8973_chip *tps, | |
146 | int req_vsel, int *vout_reg, int *gpio_val) | |
147 | { | |
148 | int i; | |
149 | bool found = false; | |
150 | int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; | |
151 | int found_index = MAX8973_MAX_VOUT_REG - 1; | |
152 | ||
153 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { | |
154 | if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { | |
155 | new_vout_reg = tps->lru_index[i]; | |
156 | found_index = i; | |
157 | found = true; | |
158 | goto update_lru_index; | |
159 | } | |
160 | } | |
161 | ||
162 | update_lru_index: | |
163 | for (i = found_index; i > 0; i--) | |
164 | tps->lru_index[i] = tps->lru_index[i - 1]; | |
165 | ||
166 | tps->lru_index[0] = new_vout_reg; | |
167 | *gpio_val = new_vout_reg; | |
168 | *vout_reg = MAX8973_VOUT + new_vout_reg; | |
169 | return found; | |
170 | } | |
171 | ||
172 | static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) | |
173 | { | |
174 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
175 | unsigned int data; | |
176 | int ret; | |
177 | ||
178 | ret = regmap_read(max->regmap, max->curr_vout_reg, &data); | |
179 | if (ret < 0) { | |
180 | dev_err(max->dev, "register %d read failed, err = %d\n", | |
181 | max->curr_vout_reg, ret); | |
182 | return ret; | |
183 | } | |
184 | return data & MAX8973_VOUT_MASK; | |
185 | } | |
186 | ||
187 | static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, | |
188 | unsigned vsel) | |
189 | { | |
190 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
191 | int ret; | |
192 | bool found = false; | |
193 | int vout_reg = max->curr_vout_reg; | |
194 | int gpio_val = max->curr_gpio_val; | |
195 | ||
196 | /* | |
197 | * If gpios are available to select the VOUT register then least | |
198 | * recently used register for new configuration. | |
199 | */ | |
fa5f509f | 200 | if (gpio_is_valid(max->dvs_gpio)) |
5928f538 LD |
201 | found = find_voltage_set_register(max, vsel, |
202 | &vout_reg, &gpio_val); | |
203 | ||
204 | if (!found) { | |
205 | ret = regmap_update_bits(max->regmap, vout_reg, | |
206 | MAX8973_VOUT_MASK, vsel); | |
207 | if (ret < 0) { | |
208 | dev_err(max->dev, "register %d update failed, err %d\n", | |
209 | vout_reg, ret); | |
210 | return ret; | |
211 | } | |
212 | max->curr_vout_reg = vout_reg; | |
213 | max->curr_vout_val[gpio_val] = vsel; | |
214 | } | |
215 | ||
216 | /* Select proper VOUT register vio gpios */ | |
fa5f509f | 217 | if (gpio_is_valid(max->dvs_gpio)) { |
5928f538 LD |
218 | gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1); |
219 | max->curr_gpio_val = gpio_val; | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
225 | { | |
226 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
227 | int ret; | |
228 | int pwm; | |
229 | ||
230 | /* Enable force PWM mode in FAST mode only. */ | |
231 | switch (mode) { | |
232 | case REGULATOR_MODE_FAST: | |
233 | pwm = MAX8973_FPWM_EN_M; | |
234 | break; | |
235 | ||
236 | case REGULATOR_MODE_NORMAL: | |
237 | pwm = 0; | |
238 | break; | |
239 | ||
240 | default: | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, | |
245 | MAX8973_FPWM_EN_M, pwm); | |
246 | if (ret < 0) | |
247 | dev_err(max->dev, "register %d update failed, err %d\n", | |
248 | MAX8973_CONTROL1, ret); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) | |
253 | { | |
254 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
255 | unsigned int data; | |
256 | int ret; | |
257 | ||
258 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); | |
259 | if (ret < 0) { | |
260 | dev_err(max->dev, "register %d read failed, err %d\n", | |
261 | MAX8973_CONTROL1, ret); | |
262 | return ret; | |
263 | } | |
264 | return (data & MAX8973_FPWM_EN_M) ? | |
265 | REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; | |
266 | } | |
267 | ||
3064c1f3 LD |
268 | static int max8973_set_ramp_delay(struct regulator_dev *rdev, |
269 | int ramp_delay) | |
270 | { | |
271 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
272 | unsigned int control; | |
273 | int ret; | |
3064c1f3 LD |
274 | |
275 | /* Set ramp delay */ | |
d0abd6f5 | 276 | if (ramp_delay <= 12000) |
3064c1f3 | 277 | control = MAX8973_RAMP_12mV_PER_US; |
d0abd6f5 | 278 | else if (ramp_delay <= 25000) |
3064c1f3 | 279 | control = MAX8973_RAMP_25mV_PER_US; |
d0abd6f5 | 280 | else if (ramp_delay <= 50000) |
3064c1f3 | 281 | control = MAX8973_RAMP_50mV_PER_US; |
d0abd6f5 | 282 | else if (ramp_delay <= 200000) |
3064c1f3 | 283 | control = MAX8973_RAMP_200mV_PER_US; |
d0abd6f5 AL |
284 | else |
285 | return -EINVAL; | |
3064c1f3 LD |
286 | |
287 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, | |
288 | MAX8973_RAMP_MASK, control); | |
289 | if (ret < 0) | |
290 | dev_err(max->dev, "register %d update failed, %d", | |
291 | MAX8973_CONTROL1, ret); | |
292 | return ret; | |
293 | } | |
294 | ||
ffaab991 LD |
295 | static int max8973_set_current_limit(struct regulator_dev *rdev, |
296 | int min_ua, int max_ua) | |
297 | { | |
298 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
299 | unsigned int val; | |
300 | int ret; | |
301 | ||
302 | if (max_ua <= 9000000) | |
303 | val = MAX8973_CKKADV_TRIP_75mV_PER_US; | |
304 | else if (max_ua <= 12000000) | |
305 | val = MAX8973_CKKADV_TRIP_150mV_PER_US; | |
306 | else | |
307 | val = MAX8973_CKKADV_TRIP_DISABLE; | |
308 | ||
309 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2, | |
310 | MAX8973_CKKADV_TRIP_MASK, val); | |
311 | if (ret < 0) { | |
312 | dev_err(max->dev, "register %d update failed: %d\n", | |
313 | MAX8973_CONTROL2, ret); | |
314 | return ret; | |
315 | } | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static int max8973_get_current_limit(struct regulator_dev *rdev) | |
320 | { | |
321 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
322 | unsigned int control2; | |
323 | int ret; | |
324 | ||
325 | ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2); | |
326 | if (ret < 0) { | |
327 | dev_err(max->dev, "register %d read failed: %d\n", | |
328 | MAX8973_CONTROL2, ret); | |
329 | return ret; | |
330 | } | |
331 | switch (control2 & MAX8973_CKKADV_TRIP_MASK) { | |
332 | case MAX8973_CKKADV_TRIP_DISABLE: | |
333 | return 15000000; | |
334 | case MAX8973_CKKADV_TRIP_150mV_PER_US: | |
335 | return 12000000; | |
336 | case MAX8973_CKKADV_TRIP_75mV_PER_US: | |
337 | return 9000000; | |
338 | default: | |
339 | break; | |
340 | } | |
341 | return 9000000; | |
342 | } | |
343 | ||
db892ff6 | 344 | static const struct regulator_ops max8973_dcdc_ops = { |
5928f538 LD |
345 | .get_voltage_sel = max8973_dcdc_get_voltage_sel, |
346 | .set_voltage_sel = max8973_dcdc_set_voltage_sel, | |
347 | .list_voltage = regulator_list_voltage_linear, | |
348 | .set_mode = max8973_dcdc_set_mode, | |
349 | .get_mode = max8973_dcdc_get_mode, | |
3064c1f3 LD |
350 | .set_voltage_time_sel = regulator_set_voltage_time_sel, |
351 | .set_ramp_delay = max8973_set_ramp_delay, | |
5928f538 LD |
352 | }; |
353 | ||
3d68dfe3 GKH |
354 | static int max8973_init_dcdc(struct max8973_chip *max, |
355 | struct max8973_regulator_platform_data *pdata) | |
5928f538 LD |
356 | { |
357 | int ret; | |
358 | uint8_t control1 = 0; | |
359 | uint8_t control2 = 0; | |
3064c1f3 LD |
360 | unsigned int data; |
361 | ||
362 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); | |
363 | if (ret < 0) { | |
364 | dev_err(max->dev, "register %d read failed, err = %d", | |
365 | MAX8973_CONTROL1, ret); | |
366 | return ret; | |
367 | } | |
368 | control1 = data & MAX8973_RAMP_MASK; | |
369 | switch (control1) { | |
370 | case MAX8973_RAMP_12mV_PER_US: | |
371 | max->desc.ramp_delay = 12000; | |
372 | break; | |
373 | case MAX8973_RAMP_25mV_PER_US: | |
366604ec | 374 | max->desc.ramp_delay = 25000; |
3064c1f3 LD |
375 | break; |
376 | case MAX8973_RAMP_50mV_PER_US: | |
377 | max->desc.ramp_delay = 50000; | |
378 | break; | |
379 | case MAX8973_RAMP_200mV_PER_US: | |
380 | max->desc.ramp_delay = 200000; | |
381 | break; | |
382 | } | |
5928f538 LD |
383 | |
384 | if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) | |
385 | control1 |= MAX8973_SNS_ENABLE; | |
386 | ||
387 | if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) | |
388 | control1 |= MAX8973_NFSR_ENABLE; | |
389 | ||
390 | if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) | |
391 | control1 |= MAX8973_AD_ENABLE; | |
392 | ||
dcd9ec6a | 393 | if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { |
5928f538 | 394 | control1 |= MAX8973_BIAS_ENABLE; |
dcd9ec6a LD |
395 | max->desc.enable_time = 20; |
396 | } else { | |
397 | max->desc.enable_time = 240; | |
398 | } | |
5928f538 LD |
399 | |
400 | if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) | |
401 | control1 |= MAX8973_FREQSHIFT_9PER; | |
402 | ||
d2d5437b LD |
403 | if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && |
404 | (max->id == MAX77621)) | |
405 | control2 |= MAX77621_T_JUNCTION_120; | |
406 | ||
5928f538 LD |
407 | if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) |
408 | control2 |= MAX8973_DISCH_ENBABLE; | |
409 | ||
410 | /* Clock advance trip configuration */ | |
411 | switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { | |
412 | case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: | |
413 | control2 |= MAX8973_CKKADV_TRIP_DISABLE; | |
414 | break; | |
415 | ||
416 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: | |
417 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; | |
418 | break; | |
419 | ||
420 | case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: | |
421 | control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; | |
422 | break; | |
423 | ||
424 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: | |
425 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; | |
426 | break; | |
427 | } | |
428 | ||
429 | /* Configure inductor value */ | |
430 | switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { | |
431 | case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: | |
432 | control2 |= MAX8973_INDUCTOR_NOMINAL; | |
433 | break; | |
434 | ||
435 | case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: | |
436 | control2 |= MAX8973_INDUCTOR_MIN_30_PER; | |
437 | break; | |
438 | ||
439 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: | |
440 | control2 |= MAX8973_INDUCTOR_PLUS_30_PER; | |
441 | break; | |
442 | ||
443 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: | |
444 | control2 |= MAX8973_INDUCTOR_PLUS_60_PER; | |
445 | break; | |
446 | } | |
447 | ||
448 | ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); | |
449 | if (ret < 0) { | |
450 | dev_err(max->dev, "register %d write failed, err = %d", | |
451 | MAX8973_CONTROL1, ret); | |
452 | return ret; | |
453 | } | |
454 | ||
455 | ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); | |
456 | if (ret < 0) { | |
457 | dev_err(max->dev, "register %d write failed, err = %d", | |
458 | MAX8973_CONTROL2, ret); | |
459 | return ret; | |
460 | } | |
461 | ||
462 | /* If external control is enabled then disable EN bit */ | |
0f7d6ece | 463 | if (max->enable_external_control && (max->id == MAX8973)) { |
5928f538 LD |
464 | ret = regmap_update_bits(max->regmap, MAX8973_VOUT, |
465 | MAX8973_VOUT_ENABLE, 0); | |
466 | if (ret < 0) | |
467 | dev_err(max->dev, "register %d update failed, err = %d", | |
468 | MAX8973_VOUT, ret); | |
469 | } | |
470 | return ret; | |
471 | } | |
472 | ||
d2d5437b LD |
473 | static int max8973_thermal_read_temp(void *data, int *temp) |
474 | { | |
475 | struct max8973_chip *mchip = data; | |
476 | unsigned int val; | |
477 | int ret; | |
478 | ||
479 | ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val); | |
480 | if (ret < 0) { | |
481 | dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret); | |
482 | return ret; | |
483 | } | |
484 | ||
485 | /* +1 degC to trigger cool devive */ | |
486 | if (val & MAX77621_CHIPID_TJINT_S) | |
487 | *temp = mchip->junction_temp_warning + 1000; | |
488 | else | |
489 | *temp = MAX77621_NORMAL_OPERATING_TEMP; | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
494 | static irqreturn_t max8973_thermal_irq(int irq, void *data) | |
495 | { | |
496 | struct max8973_chip *mchip = data; | |
497 | ||
0e70f466 SP |
498 | thermal_zone_device_update(mchip->tz_device, |
499 | THERMAL_EVENT_UNSPECIFIED); | |
d2d5437b LD |
500 | |
501 | return IRQ_HANDLED; | |
502 | } | |
503 | ||
504 | static const struct thermal_zone_of_device_ops max77621_tz_ops = { | |
505 | .get_temp = max8973_thermal_read_temp, | |
506 | }; | |
507 | ||
508 | static int max8973_thermal_init(struct max8973_chip *mchip) | |
509 | { | |
510 | struct thermal_zone_device *tzd; | |
511 | struct irq_data *irq_data; | |
512 | unsigned long irq_flags = 0; | |
513 | int ret; | |
514 | ||
515 | if (mchip->id != MAX77621) | |
516 | return 0; | |
517 | ||
518 | tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip, | |
519 | &max77621_tz_ops); | |
520 | if (IS_ERR(tzd)) { | |
521 | ret = PTR_ERR(tzd); | |
522 | dev_err(mchip->dev, "Failed to register thermal sensor: %d\n", | |
523 | ret); | |
524 | return ret; | |
525 | } | |
526 | ||
527 | if (mchip->irq <= 0) | |
528 | return 0; | |
529 | ||
530 | irq_data = irq_get_irq_data(mchip->irq); | |
531 | if (irq_data) | |
532 | irq_flags = irqd_get_trigger_type(irq_data); | |
533 | ||
534 | ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL, | |
535 | max8973_thermal_irq, | |
536 | IRQF_ONESHOT | IRQF_SHARED | irq_flags, | |
537 | dev_name(mchip->dev), mchip); | |
538 | if (ret < 0) { | |
539 | dev_err(mchip->dev, "Failed to request irq %d, %d\n", | |
540 | mchip->irq, ret); | |
541 | return ret; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
5928f538 LD |
547 | static const struct regmap_config max8973_regmap_config = { |
548 | .reg_bits = 8, | |
549 | .val_bits = 8, | |
550 | .max_register = MAX8973_CHIPID2, | |
551 | .cache_type = REGCACHE_RBTREE, | |
552 | }; | |
553 | ||
c2ffa973 LD |
554 | static struct max8973_regulator_platform_data *max8973_parse_dt( |
555 | struct device *dev) | |
556 | { | |
557 | struct max8973_regulator_platform_data *pdata; | |
558 | struct device_node *np = dev->of_node; | |
559 | int ret; | |
560 | u32 pval; | |
3692db3a LD |
561 | bool etr_enable; |
562 | bool etr_sensitivity_high; | |
c2ffa973 LD |
563 | |
564 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
565 | if (!pdata) | |
566 | return NULL; | |
567 | ||
568 | pdata->enable_ext_control = of_property_read_bool(np, | |
569 | "maxim,externally-enable"); | |
570 | pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); | |
571 | ||
572 | ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); | |
573 | if (!ret) | |
574 | pdata->dvs_def_state = pval; | |
575 | ||
576 | if (of_property_read_bool(np, "maxim,enable-remote-sense")) | |
577 | pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; | |
578 | ||
579 | if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) | |
580 | pdata->control_flags |= | |
581 | MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; | |
582 | ||
583 | if (of_property_read_bool(np, "maxim,enable-active-discharge")) | |
584 | pdata->control_flags |= | |
585 | MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; | |
586 | ||
587 | if (of_property_read_bool(np, "maxim,enable-frequency-shift")) | |
588 | pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; | |
589 | ||
590 | if (of_property_read_bool(np, "maxim,enable-bias-control")) | |
127e1062 | 591 | pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; |
c2ffa973 | 592 | |
3692db3a LD |
593 | etr_enable = of_property_read_bool(np, "maxim,enable-etr"); |
594 | etr_sensitivity_high = of_property_read_bool(np, | |
595 | "maxim,enable-high-etr-sensitivity"); | |
596 | if (etr_sensitivity_high) | |
597 | etr_enable = true; | |
598 | ||
599 | if (etr_enable) { | |
600 | if (etr_sensitivity_high) | |
601 | pdata->control_flags |= | |
602 | MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US; | |
603 | else | |
604 | pdata->control_flags |= | |
605 | MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US; | |
606 | } else { | |
607 | pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED; | |
608 | } | |
609 | ||
d2d5437b LD |
610 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; |
611 | ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval); | |
612 | if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) | |
613 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; | |
614 | ||
c2ffa973 LD |
615 | return pdata; |
616 | } | |
617 | ||
0f7d6ece LD |
618 | static const struct of_device_id of_max8973_match_tbl[] = { |
619 | { .compatible = "maxim,max8973", .data = (void *)MAX8973, }, | |
620 | { .compatible = "maxim,max77621", .data = (void *)MAX77621, }, | |
621 | { }, | |
622 | }; | |
623 | MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); | |
624 | ||
3d68dfe3 GKH |
625 | static int max8973_probe(struct i2c_client *client, |
626 | const struct i2c_device_id *id) | |
5928f538 LD |
627 | { |
628 | struct max8973_regulator_platform_data *pdata; | |
69eb0980 | 629 | struct regulator_init_data *ridata; |
5928f538 LD |
630 | struct regulator_config config = { }; |
631 | struct regulator_dev *rdev; | |
632 | struct max8973_chip *max; | |
c2ffa973 | 633 | bool pdata_from_dt = false; |
0f7d6ece | 634 | unsigned int chip_id; |
e7d2be69 LW |
635 | struct gpio_desc *gpiod; |
636 | enum gpiod_flags gflags; | |
5928f538 LD |
637 | int ret; |
638 | ||
dff91d0b | 639 | pdata = dev_get_platdata(&client->dev); |
42dc3023 | 640 | |
c2ffa973 LD |
641 | if (!pdata && client->dev.of_node) { |
642 | pdata = max8973_parse_dt(&client->dev); | |
643 | pdata_from_dt = true; | |
644 | } | |
645 | ||
646 | if (!pdata) { | |
5928f538 LD |
647 | dev_err(&client->dev, "No Platform data"); |
648 | return -EIO; | |
649 | } | |
650 | ||
e7d2be69 | 651 | if (pdata->dvs_gpio == -EPROBE_DEFER) |
c2ffa973 LD |
652 | return -EPROBE_DEFER; |
653 | ||
5928f538 | 654 | max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); |
21024dee | 655 | if (!max) |
5928f538 | 656 | return -ENOMEM; |
5928f538 LD |
657 | |
658 | max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); | |
659 | if (IS_ERR(max->regmap)) { | |
660 | ret = PTR_ERR(max->regmap); | |
661 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); | |
662 | return ret; | |
663 | } | |
664 | ||
0f7d6ece LD |
665 | if (client->dev.of_node) { |
666 | const struct of_device_id *match; | |
667 | ||
668 | match = of_match_device(of_match_ptr(of_max8973_match_tbl), | |
669 | &client->dev); | |
670 | if (!match) | |
671 | return -ENODATA; | |
672 | max->id = (u32)((uintptr_t)match->data); | |
673 | } else { | |
674 | max->id = id->driver_data; | |
675 | } | |
676 | ||
677 | ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id); | |
678 | if (ret < 0) { | |
679 | dev_err(&client->dev, "register CHIPID1 read failed, %d", ret); | |
680 | return ret; | |
681 | } | |
682 | ||
683 | dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n", | |
684 | (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); | |
685 | ||
5928f538 | 686 | i2c_set_clientdata(client, max); |
db892ff6 | 687 | max->ops = max8973_dcdc_ops; |
5928f538 LD |
688 | max->dev = &client->dev; |
689 | max->desc.name = id->name; | |
690 | max->desc.id = 0; | |
db892ff6 | 691 | max->desc.ops = &max->ops; |
5928f538 LD |
692 | max->desc.type = REGULATOR_VOLTAGE; |
693 | max->desc.owner = THIS_MODULE; | |
694 | max->desc.min_uV = MAX8973_MIN_VOLATGE; | |
695 | max->desc.uV_step = MAX8973_VOLATGE_STEP; | |
696 | max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; | |
697 | ||
69eb0980 | 698 | max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; |
69eb0980 LD |
699 | max->enable_external_control = pdata->enable_ext_control; |
700 | max->curr_gpio_val = pdata->dvs_def_state; | |
701 | max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; | |
d2d5437b | 702 | max->junction_temp_warning = pdata->junction_temp_warning; |
69eb0980 | 703 | |
5928f538 | 704 | max->lru_index[0] = max->curr_vout_reg; |
5928f538 LD |
705 | |
706 | if (gpio_is_valid(max->dvs_gpio)) { | |
707 | int gpio_flags; | |
708 | int i; | |
709 | ||
710 | gpio_flags = (pdata->dvs_def_state) ? | |
711 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; | |
712 | ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, | |
713 | gpio_flags, "max8973-dvs"); | |
714 | if (ret) { | |
715 | dev_err(&client->dev, | |
716 | "gpio_request for gpio %d failed, err = %d\n", | |
717 | max->dvs_gpio, ret); | |
718 | return ret; | |
719 | } | |
5928f538 LD |
720 | |
721 | /* | |
722 | * Initialize the lru index with vout_reg id | |
723 | * The index 0 will be most recently used and | |
724 | * set with the max->curr_vout_reg */ | |
725 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) | |
726 | max->lru_index[i] = i; | |
727 | max->lru_index[0] = max->curr_vout_reg; | |
728 | max->lru_index[max->curr_vout_reg] = 0; | |
b10c7f3c MP |
729 | } else { |
730 | /* | |
731 | * If there is no DVS GPIO, the VOUT register | |
732 | * address is fixed. | |
733 | */ | |
734 | max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap; | |
735 | max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap; | |
736 | max->desc.vsel_reg = max->curr_vout_reg; | |
737 | max->desc.vsel_mask = MAX8973_VOUT_MASK; | |
5928f538 LD |
738 | } |
739 | ||
c2ffa973 LD |
740 | if (pdata_from_dt) |
741 | pdata->reg_init_data = of_get_regulator_init_data(&client->dev, | |
742 | client->dev.of_node, &max->desc); | |
743 | ||
0f7d6ece LD |
744 | ridata = pdata->reg_init_data; |
745 | switch (max->id) { | |
746 | case MAX8973: | |
747 | if (!pdata->enable_ext_control) { | |
748 | max->desc.enable_reg = MAX8973_VOUT; | |
749 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; | |
750 | max->ops.enable = regulator_enable_regmap; | |
751 | max->ops.disable = regulator_disable_regmap; | |
752 | max->ops.is_enabled = regulator_is_enabled_regmap; | |
753 | break; | |
754 | } | |
755 | ||
e7d2be69 LW |
756 | if (ridata && (ridata->constraints.always_on || |
757 | ridata->constraints.boot_on)) | |
758 | gflags = GPIOD_OUT_HIGH; | |
759 | else | |
760 | gflags = GPIOD_OUT_LOW; | |
63239e4b | 761 | gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
e7d2be69 LW |
762 | gpiod = devm_gpiod_get_optional(&client->dev, |
763 | "maxim,enable", | |
764 | gflags); | |
765 | if (IS_ERR(gpiod)) | |
766 | return PTR_ERR(gpiod); | |
767 | if (gpiod) { | |
768 | config.ena_gpiod = gpiod; | |
769 | max->enable_external_control = true; | |
0f7d6ece | 770 | } |
e7d2be69 | 771 | |
0f7d6ece LD |
772 | break; |
773 | ||
774 | case MAX77621: | |
e7d2be69 LW |
775 | /* |
776 | * We do not let the core switch this regulator on/off, | |
777 | * we just leave it on. | |
778 | */ | |
779 | gpiod = devm_gpiod_get_optional(&client->dev, | |
780 | "maxim,enable", | |
781 | GPIOD_OUT_HIGH); | |
782 | if (IS_ERR(gpiod)) | |
783 | return PTR_ERR(gpiod); | |
784 | if (gpiod) | |
785 | max->enable_external_control = true; | |
0f7d6ece LD |
786 | |
787 | max->desc.enable_reg = MAX8973_VOUT; | |
788 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; | |
789 | max->ops.enable = regulator_enable_regmap; | |
790 | max->ops.disable = regulator_disable_regmap; | |
791 | max->ops.is_enabled = regulator_is_enabled_regmap; | |
ffaab991 LD |
792 | max->ops.set_current_limit = max8973_set_current_limit; |
793 | max->ops.get_current_limit = max8973_get_current_limit; | |
0f7d6ece LD |
794 | break; |
795 | default: | |
796 | break; | |
797 | } | |
798 | ||
c2ffa973 LD |
799 | ret = max8973_init_dcdc(max, pdata); |
800 | if (ret < 0) { | |
801 | dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); | |
802 | return ret; | |
5928f538 LD |
803 | } |
804 | ||
805 | config.dev = &client->dev; | |
c2ffa973 | 806 | config.init_data = pdata->reg_init_data; |
5928f538 LD |
807 | config.driver_data = max; |
808 | config.of_node = client->dev.of_node; | |
809 | config.regmap = max->regmap; | |
810 | ||
48bd226f LW |
811 | /* |
812 | * Register the regulators | |
813 | * Turn the GPIO descriptor over to the regulator core for | |
814 | * lifecycle management if we pass an ena_gpiod. | |
815 | */ | |
816 | if (config.ena_gpiod) | |
817 | devm_gpiod_unhinge(&client->dev, config.ena_gpiod); | |
8d581fd0 | 818 | rdev = devm_regulator_register(&client->dev, &max->desc, &config); |
5928f538 LD |
819 | if (IS_ERR(rdev)) { |
820 | ret = PTR_ERR(rdev); | |
821 | dev_err(max->dev, "regulator register failed, err %d\n", ret); | |
822 | return ret; | |
823 | } | |
824 | ||
d2d5437b | 825 | max8973_thermal_init(max); |
5928f538 LD |
826 | return 0; |
827 | } | |
828 | ||
5928f538 | 829 | static const struct i2c_device_id max8973_id[] = { |
0f7d6ece LD |
830 | {.name = "max8973", .driver_data = MAX8973}, |
831 | {.name = "max77621", .driver_data = MAX77621}, | |
5928f538 LD |
832 | {}, |
833 | }; | |
5928f538 LD |
834 | MODULE_DEVICE_TABLE(i2c, max8973_id); |
835 | ||
836 | static struct i2c_driver max8973_i2c_driver = { | |
837 | .driver = { | |
838 | .name = "max8973", | |
0f7d6ece | 839 | .of_match_table = of_max8973_match_tbl, |
5928f538 LD |
840 | }, |
841 | .probe = max8973_probe, | |
5928f538 LD |
842 | .id_table = max8973_id, |
843 | }; | |
844 | ||
845 | static int __init max8973_init(void) | |
846 | { | |
847 | return i2c_add_driver(&max8973_i2c_driver); | |
848 | } | |
849 | subsys_initcall(max8973_init); | |
850 | ||
851 | static void __exit max8973_cleanup(void) | |
852 | { | |
853 | i2c_del_driver(&max8973_i2c_driver); | |
854 | } | |
855 | module_exit(max8973_cleanup); | |
856 | ||
857 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
858 | MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); | |
859 | MODULE_LICENSE("GPL v2"); |