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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> |
c2ffa973 | 37 | #include <linux/of_gpio.h> |
5928f538 LD |
38 | #include <linux/i2c.h> |
39 | #include <linux/slab.h> | |
40 | #include <linux/regmap.h> | |
d2d5437b LD |
41 | #include <linux/thermal.h> |
42 | #include <linux/irq.h> | |
43 | #include <linux/interrupt.h> | |
5928f538 LD |
44 | |
45 | /* Register definitions */ | |
46 | #define MAX8973_VOUT 0x0 | |
47 | #define MAX8973_VOUT_DVS 0x1 | |
48 | #define MAX8973_CONTROL1 0x2 | |
49 | #define MAX8973_CONTROL2 0x3 | |
50 | #define MAX8973_CHIPID1 0x4 | |
51 | #define MAX8973_CHIPID2 0x5 | |
52 | ||
53 | #define MAX8973_MAX_VOUT_REG 2 | |
54 | ||
55 | /* MAX8973_VOUT */ | |
56 | #define MAX8973_VOUT_ENABLE BIT(7) | |
57 | #define MAX8973_VOUT_MASK 0x7F | |
58 | ||
59 | /* MAX8973_VOUT_DVS */ | |
60 | #define MAX8973_DVS_VOUT_MASK 0x7F | |
61 | ||
62 | /* MAX8973_CONTROL1 */ | |
63 | #define MAX8973_SNS_ENABLE BIT(7) | |
64 | #define MAX8973_FPWM_EN_M BIT(6) | |
65 | #define MAX8973_NFSR_ENABLE BIT(5) | |
66 | #define MAX8973_AD_ENABLE BIT(4) | |
67 | #define MAX8973_BIAS_ENABLE BIT(3) | |
68 | #define MAX8973_FREQSHIFT_9PER BIT(2) | |
69 | ||
70 | #define MAX8973_RAMP_12mV_PER_US 0x0 | |
71 | #define MAX8973_RAMP_25mV_PER_US 0x1 | |
72 | #define MAX8973_RAMP_50mV_PER_US 0x2 | |
73 | #define MAX8973_RAMP_200mV_PER_US 0x3 | |
3064c1f3 | 74 | #define MAX8973_RAMP_MASK 0x3 |
5928f538 LD |
75 | |
76 | /* MAX8973_CONTROL2 */ | |
77 | #define MAX8973_WDTMR_ENABLE BIT(6) | |
78 | #define MAX8973_DISCH_ENBABLE BIT(5) | |
79 | #define MAX8973_FT_ENABLE BIT(4) | |
d2d5437b | 80 | #define MAX77621_T_JUNCTION_120 BIT(7) |
5928f538 | 81 | |
ffaab991 | 82 | #define MAX8973_CKKADV_TRIP_MASK 0xC |
5928f538 LD |
83 | #define MAX8973_CKKADV_TRIP_DISABLE 0xC |
84 | #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 | |
85 | #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 | |
86 | #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 | |
87 | #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 | |
88 | ||
89 | #define MAX8973_INDUCTOR_MIN_30_PER 0x0 | |
90 | #define MAX8973_INDUCTOR_NOMINAL 0x1 | |
91 | #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 | |
92 | #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 | |
93 | #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 | |
94 | ||
95 | #define MAX8973_MIN_VOLATGE 606250 | |
96 | #define MAX8973_MAX_VOLATGE 1400000 | |
97 | #define MAX8973_VOLATGE_STEP 6250 | |
98 | #define MAX8973_BUCK_N_VOLTAGE 0x80 | |
99 | ||
d2d5437b LD |
100 | #define MAX77621_CHIPID_TJINT_S BIT(0) |
101 | ||
102 | #define MAX77621_NORMAL_OPERATING_TEMP 100000 | |
103 | #define MAX77621_TJINT_WARNING_TEMP_120 120000 | |
104 | #define MAX77621_TJINT_WARNING_TEMP_140 140000 | |
105 | ||
0f7d6ece LD |
106 | enum device_id { |
107 | MAX8973, | |
108 | MAX77621 | |
109 | }; | |
110 | ||
5928f538 LD |
111 | /* Maxim 8973 chip information */ |
112 | struct max8973_chip { | |
113 | struct device *dev; | |
114 | struct regulator_desc desc; | |
5928f538 LD |
115 | struct regmap *regmap; |
116 | bool enable_external_control; | |
69eb0980 | 117 | int enable_gpio; |
5928f538 LD |
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; | |
274 | int ret_val; | |
275 | ||
276 | /* Set ramp delay */ | |
277 | if (ramp_delay < 25000) { | |
278 | control = MAX8973_RAMP_12mV_PER_US; | |
279 | ret_val = 12000; | |
280 | } else if (ramp_delay < 50000) { | |
281 | control = MAX8973_RAMP_25mV_PER_US; | |
282 | ret_val = 25000; | |
283 | } else if (ramp_delay < 200000) { | |
284 | control = MAX8973_RAMP_50mV_PER_US; | |
285 | ret_val = 50000; | |
286 | } else { | |
287 | control = MAX8973_RAMP_200mV_PER_US; | |
288 | ret_val = 200000; | |
289 | } | |
290 | ||
291 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, | |
292 | MAX8973_RAMP_MASK, control); | |
293 | if (ret < 0) | |
294 | dev_err(max->dev, "register %d update failed, %d", | |
295 | MAX8973_CONTROL1, ret); | |
296 | return ret; | |
297 | } | |
298 | ||
ffaab991 LD |
299 | static int max8973_set_current_limit(struct regulator_dev *rdev, |
300 | int min_ua, int max_ua) | |
301 | { | |
302 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
303 | unsigned int val; | |
304 | int ret; | |
305 | ||
306 | if (max_ua <= 9000000) | |
307 | val = MAX8973_CKKADV_TRIP_75mV_PER_US; | |
308 | else if (max_ua <= 12000000) | |
309 | val = MAX8973_CKKADV_TRIP_150mV_PER_US; | |
310 | else | |
311 | val = MAX8973_CKKADV_TRIP_DISABLE; | |
312 | ||
313 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2, | |
314 | MAX8973_CKKADV_TRIP_MASK, val); | |
315 | if (ret < 0) { | |
316 | dev_err(max->dev, "register %d update failed: %d\n", | |
317 | MAX8973_CONTROL2, ret); | |
318 | return ret; | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static int max8973_get_current_limit(struct regulator_dev *rdev) | |
324 | { | |
325 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
326 | unsigned int control2; | |
327 | int ret; | |
328 | ||
329 | ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2); | |
330 | if (ret < 0) { | |
331 | dev_err(max->dev, "register %d read failed: %d\n", | |
332 | MAX8973_CONTROL2, ret); | |
333 | return ret; | |
334 | } | |
335 | switch (control2 & MAX8973_CKKADV_TRIP_MASK) { | |
336 | case MAX8973_CKKADV_TRIP_DISABLE: | |
337 | return 15000000; | |
338 | case MAX8973_CKKADV_TRIP_150mV_PER_US: | |
339 | return 12000000; | |
340 | case MAX8973_CKKADV_TRIP_75mV_PER_US: | |
341 | return 9000000; | |
342 | default: | |
343 | break; | |
344 | } | |
345 | return 9000000; | |
346 | } | |
347 | ||
db892ff6 | 348 | static const struct regulator_ops max8973_dcdc_ops = { |
5928f538 LD |
349 | .get_voltage_sel = max8973_dcdc_get_voltage_sel, |
350 | .set_voltage_sel = max8973_dcdc_set_voltage_sel, | |
351 | .list_voltage = regulator_list_voltage_linear, | |
352 | .set_mode = max8973_dcdc_set_mode, | |
353 | .get_mode = max8973_dcdc_get_mode, | |
3064c1f3 LD |
354 | .set_voltage_time_sel = regulator_set_voltage_time_sel, |
355 | .set_ramp_delay = max8973_set_ramp_delay, | |
5928f538 LD |
356 | }; |
357 | ||
3d68dfe3 GKH |
358 | static int max8973_init_dcdc(struct max8973_chip *max, |
359 | struct max8973_regulator_platform_data *pdata) | |
5928f538 LD |
360 | { |
361 | int ret; | |
362 | uint8_t control1 = 0; | |
363 | uint8_t control2 = 0; | |
3064c1f3 LD |
364 | unsigned int data; |
365 | ||
366 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); | |
367 | if (ret < 0) { | |
368 | dev_err(max->dev, "register %d read failed, err = %d", | |
369 | MAX8973_CONTROL1, ret); | |
370 | return ret; | |
371 | } | |
372 | control1 = data & MAX8973_RAMP_MASK; | |
373 | switch (control1) { | |
374 | case MAX8973_RAMP_12mV_PER_US: | |
375 | max->desc.ramp_delay = 12000; | |
376 | break; | |
377 | case MAX8973_RAMP_25mV_PER_US: | |
366604ec | 378 | max->desc.ramp_delay = 25000; |
3064c1f3 LD |
379 | break; |
380 | case MAX8973_RAMP_50mV_PER_US: | |
381 | max->desc.ramp_delay = 50000; | |
382 | break; | |
383 | case MAX8973_RAMP_200mV_PER_US: | |
384 | max->desc.ramp_delay = 200000; | |
385 | break; | |
386 | } | |
5928f538 LD |
387 | |
388 | if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) | |
389 | control1 |= MAX8973_SNS_ENABLE; | |
390 | ||
391 | if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) | |
392 | control1 |= MAX8973_NFSR_ENABLE; | |
393 | ||
394 | if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) | |
395 | control1 |= MAX8973_AD_ENABLE; | |
396 | ||
dcd9ec6a | 397 | if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { |
5928f538 | 398 | control1 |= MAX8973_BIAS_ENABLE; |
dcd9ec6a LD |
399 | max->desc.enable_time = 20; |
400 | } else { | |
401 | max->desc.enable_time = 240; | |
402 | } | |
5928f538 LD |
403 | |
404 | if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) | |
405 | control1 |= MAX8973_FREQSHIFT_9PER; | |
406 | ||
d2d5437b LD |
407 | if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && |
408 | (max->id == MAX77621)) | |
409 | control2 |= MAX77621_T_JUNCTION_120; | |
410 | ||
5928f538 LD |
411 | if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) |
412 | control2 |= MAX8973_DISCH_ENBABLE; | |
413 | ||
414 | /* Clock advance trip configuration */ | |
415 | switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { | |
416 | case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: | |
417 | control2 |= MAX8973_CKKADV_TRIP_DISABLE; | |
418 | break; | |
419 | ||
420 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: | |
421 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; | |
422 | break; | |
423 | ||
424 | case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: | |
425 | control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; | |
426 | break; | |
427 | ||
428 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: | |
429 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; | |
430 | break; | |
431 | } | |
432 | ||
433 | /* Configure inductor value */ | |
434 | switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { | |
435 | case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: | |
436 | control2 |= MAX8973_INDUCTOR_NOMINAL; | |
437 | break; | |
438 | ||
439 | case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: | |
440 | control2 |= MAX8973_INDUCTOR_MIN_30_PER; | |
441 | break; | |
442 | ||
443 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: | |
444 | control2 |= MAX8973_INDUCTOR_PLUS_30_PER; | |
445 | break; | |
446 | ||
447 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: | |
448 | control2 |= MAX8973_INDUCTOR_PLUS_60_PER; | |
449 | break; | |
450 | } | |
451 | ||
452 | ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); | |
453 | if (ret < 0) { | |
454 | dev_err(max->dev, "register %d write failed, err = %d", | |
455 | MAX8973_CONTROL1, ret); | |
456 | return ret; | |
457 | } | |
458 | ||
459 | ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); | |
460 | if (ret < 0) { | |
461 | dev_err(max->dev, "register %d write failed, err = %d", | |
462 | MAX8973_CONTROL2, ret); | |
463 | return ret; | |
464 | } | |
465 | ||
466 | /* If external control is enabled then disable EN bit */ | |
0f7d6ece | 467 | if (max->enable_external_control && (max->id == MAX8973)) { |
5928f538 LD |
468 | ret = regmap_update_bits(max->regmap, MAX8973_VOUT, |
469 | MAX8973_VOUT_ENABLE, 0); | |
470 | if (ret < 0) | |
471 | dev_err(max->dev, "register %d update failed, err = %d", | |
472 | MAX8973_VOUT, ret); | |
473 | } | |
474 | return ret; | |
475 | } | |
476 | ||
d2d5437b LD |
477 | static int max8973_thermal_read_temp(void *data, int *temp) |
478 | { | |
479 | struct max8973_chip *mchip = data; | |
480 | unsigned int val; | |
481 | int ret; | |
482 | ||
483 | ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val); | |
484 | if (ret < 0) { | |
485 | dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret); | |
486 | return ret; | |
487 | } | |
488 | ||
489 | /* +1 degC to trigger cool devive */ | |
490 | if (val & MAX77621_CHIPID_TJINT_S) | |
491 | *temp = mchip->junction_temp_warning + 1000; | |
492 | else | |
493 | *temp = MAX77621_NORMAL_OPERATING_TEMP; | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static irqreturn_t max8973_thermal_irq(int irq, void *data) | |
499 | { | |
500 | struct max8973_chip *mchip = data; | |
501 | ||
502 | thermal_zone_device_update(mchip->tz_device); | |
503 | ||
504 | return IRQ_HANDLED; | |
505 | } | |
506 | ||
507 | static const struct thermal_zone_of_device_ops max77621_tz_ops = { | |
508 | .get_temp = max8973_thermal_read_temp, | |
509 | }; | |
510 | ||
511 | static int max8973_thermal_init(struct max8973_chip *mchip) | |
512 | { | |
513 | struct thermal_zone_device *tzd; | |
514 | struct irq_data *irq_data; | |
515 | unsigned long irq_flags = 0; | |
516 | int ret; | |
517 | ||
518 | if (mchip->id != MAX77621) | |
519 | return 0; | |
520 | ||
521 | tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip, | |
522 | &max77621_tz_ops); | |
523 | if (IS_ERR(tzd)) { | |
524 | ret = PTR_ERR(tzd); | |
525 | dev_err(mchip->dev, "Failed to register thermal sensor: %d\n", | |
526 | ret); | |
527 | return ret; | |
528 | } | |
529 | ||
530 | if (mchip->irq <= 0) | |
531 | return 0; | |
532 | ||
533 | irq_data = irq_get_irq_data(mchip->irq); | |
534 | if (irq_data) | |
535 | irq_flags = irqd_get_trigger_type(irq_data); | |
536 | ||
537 | ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL, | |
538 | max8973_thermal_irq, | |
539 | IRQF_ONESHOT | IRQF_SHARED | irq_flags, | |
540 | dev_name(mchip->dev), mchip); | |
541 | if (ret < 0) { | |
542 | dev_err(mchip->dev, "Failed to request irq %d, %d\n", | |
543 | mchip->irq, ret); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
5928f538 LD |
550 | static const struct regmap_config max8973_regmap_config = { |
551 | .reg_bits = 8, | |
552 | .val_bits = 8, | |
553 | .max_register = MAX8973_CHIPID2, | |
554 | .cache_type = REGCACHE_RBTREE, | |
555 | }; | |
556 | ||
c2ffa973 LD |
557 | static struct max8973_regulator_platform_data *max8973_parse_dt( |
558 | struct device *dev) | |
559 | { | |
560 | struct max8973_regulator_platform_data *pdata; | |
561 | struct device_node *np = dev->of_node; | |
562 | int ret; | |
563 | u32 pval; | |
3692db3a LD |
564 | bool etr_enable; |
565 | bool etr_sensitivity_high; | |
c2ffa973 LD |
566 | |
567 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
568 | if (!pdata) | |
569 | return NULL; | |
570 | ||
571 | pdata->enable_ext_control = of_property_read_bool(np, | |
572 | "maxim,externally-enable"); | |
69eb0980 | 573 | pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0); |
c2ffa973 LD |
574 | pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); |
575 | ||
576 | ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); | |
577 | if (!ret) | |
578 | pdata->dvs_def_state = pval; | |
579 | ||
580 | if (of_property_read_bool(np, "maxim,enable-remote-sense")) | |
581 | pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; | |
582 | ||
583 | if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) | |
584 | pdata->control_flags |= | |
585 | MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; | |
586 | ||
587 | if (of_property_read_bool(np, "maxim,enable-active-discharge")) | |
588 | pdata->control_flags |= | |
589 | MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; | |
590 | ||
591 | if (of_property_read_bool(np, "maxim,enable-frequency-shift")) | |
592 | pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; | |
593 | ||
594 | if (of_property_read_bool(np, "maxim,enable-bias-control")) | |
127e1062 | 595 | pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; |
c2ffa973 | 596 | |
3692db3a LD |
597 | etr_enable = of_property_read_bool(np, "maxim,enable-etr"); |
598 | etr_sensitivity_high = of_property_read_bool(np, | |
599 | "maxim,enable-high-etr-sensitivity"); | |
600 | if (etr_sensitivity_high) | |
601 | etr_enable = true; | |
602 | ||
603 | if (etr_enable) { | |
604 | if (etr_sensitivity_high) | |
605 | pdata->control_flags |= | |
606 | MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US; | |
607 | else | |
608 | pdata->control_flags |= | |
609 | MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US; | |
610 | } else { | |
611 | pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED; | |
612 | } | |
613 | ||
d2d5437b LD |
614 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; |
615 | ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval); | |
616 | if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) | |
617 | pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; | |
618 | ||
c2ffa973 LD |
619 | return pdata; |
620 | } | |
621 | ||
0f7d6ece LD |
622 | static const struct of_device_id of_max8973_match_tbl[] = { |
623 | { .compatible = "maxim,max8973", .data = (void *)MAX8973, }, | |
624 | { .compatible = "maxim,max77621", .data = (void *)MAX77621, }, | |
625 | { }, | |
626 | }; | |
627 | MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); | |
628 | ||
3d68dfe3 GKH |
629 | static int max8973_probe(struct i2c_client *client, |
630 | const struct i2c_device_id *id) | |
5928f538 LD |
631 | { |
632 | struct max8973_regulator_platform_data *pdata; | |
69eb0980 | 633 | struct regulator_init_data *ridata; |
5928f538 LD |
634 | struct regulator_config config = { }; |
635 | struct regulator_dev *rdev; | |
636 | struct max8973_chip *max; | |
c2ffa973 | 637 | bool pdata_from_dt = false; |
0f7d6ece | 638 | unsigned int chip_id; |
5928f538 LD |
639 | int ret; |
640 | ||
dff91d0b | 641 | pdata = dev_get_platdata(&client->dev); |
42dc3023 | 642 | |
c2ffa973 LD |
643 | if (!pdata && client->dev.of_node) { |
644 | pdata = max8973_parse_dt(&client->dev); | |
645 | pdata_from_dt = true; | |
646 | } | |
647 | ||
648 | if (!pdata) { | |
5928f538 LD |
649 | dev_err(&client->dev, "No Platform data"); |
650 | return -EIO; | |
651 | } | |
652 | ||
69eb0980 LD |
653 | if ((pdata->dvs_gpio == -EPROBE_DEFER) || |
654 | (pdata->enable_gpio == -EPROBE_DEFER)) | |
c2ffa973 LD |
655 | return -EPROBE_DEFER; |
656 | ||
5928f538 | 657 | max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); |
21024dee | 658 | if (!max) |
5928f538 | 659 | return -ENOMEM; |
5928f538 LD |
660 | |
661 | max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); | |
662 | if (IS_ERR(max->regmap)) { | |
663 | ret = PTR_ERR(max->regmap); | |
664 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); | |
665 | return ret; | |
666 | } | |
667 | ||
0f7d6ece LD |
668 | if (client->dev.of_node) { |
669 | const struct of_device_id *match; | |
670 | ||
671 | match = of_match_device(of_match_ptr(of_max8973_match_tbl), | |
672 | &client->dev); | |
673 | if (!match) | |
674 | return -ENODATA; | |
675 | max->id = (u32)((uintptr_t)match->data); | |
676 | } else { | |
677 | max->id = id->driver_data; | |
678 | } | |
679 | ||
680 | ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id); | |
681 | if (ret < 0) { | |
682 | dev_err(&client->dev, "register CHIPID1 read failed, %d", ret); | |
683 | return ret; | |
684 | } | |
685 | ||
686 | dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n", | |
687 | (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); | |
688 | ||
5928f538 | 689 | i2c_set_clientdata(client, max); |
db892ff6 | 690 | max->ops = max8973_dcdc_ops; |
5928f538 LD |
691 | max->dev = &client->dev; |
692 | max->desc.name = id->name; | |
693 | max->desc.id = 0; | |
db892ff6 | 694 | max->desc.ops = &max->ops; |
5928f538 LD |
695 | max->desc.type = REGULATOR_VOLTAGE; |
696 | max->desc.owner = THIS_MODULE; | |
697 | max->desc.min_uV = MAX8973_MIN_VOLATGE; | |
698 | max->desc.uV_step = MAX8973_VOLATGE_STEP; | |
699 | max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; | |
700 | ||
69eb0980 LD |
701 | max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; |
702 | max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL; | |
703 | max->enable_external_control = pdata->enable_ext_control; | |
704 | max->curr_gpio_val = pdata->dvs_def_state; | |
705 | max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; | |
d2d5437b | 706 | max->junction_temp_warning = pdata->junction_temp_warning; |
69eb0980 LD |
707 | |
708 | if (gpio_is_valid(max->enable_gpio)) | |
709 | max->enable_external_control = true; | |
710 | ||
5928f538 | 711 | max->lru_index[0] = max->curr_vout_reg; |
5928f538 LD |
712 | |
713 | if (gpio_is_valid(max->dvs_gpio)) { | |
714 | int gpio_flags; | |
715 | int i; | |
716 | ||
717 | gpio_flags = (pdata->dvs_def_state) ? | |
718 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; | |
719 | ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, | |
720 | gpio_flags, "max8973-dvs"); | |
721 | if (ret) { | |
722 | dev_err(&client->dev, | |
723 | "gpio_request for gpio %d failed, err = %d\n", | |
724 | max->dvs_gpio, ret); | |
725 | return ret; | |
726 | } | |
5928f538 LD |
727 | |
728 | /* | |
729 | * Initialize the lru index with vout_reg id | |
730 | * The index 0 will be most recently used and | |
731 | * set with the max->curr_vout_reg */ | |
732 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) | |
733 | max->lru_index[i] = i; | |
734 | max->lru_index[0] = max->curr_vout_reg; | |
735 | max->lru_index[max->curr_vout_reg] = 0; | |
b10c7f3c MP |
736 | } else { |
737 | /* | |
738 | * If there is no DVS GPIO, the VOUT register | |
739 | * address is fixed. | |
740 | */ | |
741 | max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap; | |
742 | max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap; | |
743 | max->desc.vsel_reg = max->curr_vout_reg; | |
744 | max->desc.vsel_mask = MAX8973_VOUT_MASK; | |
5928f538 LD |
745 | } |
746 | ||
c2ffa973 LD |
747 | if (pdata_from_dt) |
748 | pdata->reg_init_data = of_get_regulator_init_data(&client->dev, | |
749 | client->dev.of_node, &max->desc); | |
750 | ||
0f7d6ece LD |
751 | ridata = pdata->reg_init_data; |
752 | switch (max->id) { | |
753 | case MAX8973: | |
754 | if (!pdata->enable_ext_control) { | |
755 | max->desc.enable_reg = MAX8973_VOUT; | |
756 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; | |
757 | max->ops.enable = regulator_enable_regmap; | |
758 | max->ops.disable = regulator_disable_regmap; | |
759 | max->ops.is_enabled = regulator_is_enabled_regmap; | |
760 | break; | |
761 | } | |
762 | ||
763 | if (gpio_is_valid(max->enable_gpio)) { | |
764 | config.ena_gpio_flags = GPIOF_OUT_INIT_LOW; | |
765 | if (ridata && (ridata->constraints.always_on || | |
766 | ridata->constraints.boot_on)) | |
767 | config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH; | |
768 | config.ena_gpio = max->enable_gpio; | |
769 | } | |
770 | break; | |
771 | ||
772 | case MAX77621: | |
773 | if (gpio_is_valid(max->enable_gpio)) { | |
774 | ret = devm_gpio_request_one(&client->dev, | |
775 | max->enable_gpio, GPIOF_OUT_INIT_HIGH, | |
776 | "max8973-en-gpio"); | |
777 | if (ret) { | |
778 | dev_err(&client->dev, | |
779 | "gpio_request for gpio %d failed: %d\n", | |
780 | max->enable_gpio, ret); | |
781 | return ret; | |
782 | } | |
783 | } | |
784 | ||
785 | max->desc.enable_reg = MAX8973_VOUT; | |
786 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; | |
787 | max->ops.enable = regulator_enable_regmap; | |
788 | max->ops.disable = regulator_disable_regmap; | |
789 | max->ops.is_enabled = regulator_is_enabled_regmap; | |
ffaab991 LD |
790 | max->ops.set_current_limit = max8973_set_current_limit; |
791 | max->ops.get_current_limit = max8973_get_current_limit; | |
0f7d6ece LD |
792 | break; |
793 | default: | |
794 | break; | |
795 | } | |
796 | ||
c2ffa973 LD |
797 | ret = max8973_init_dcdc(max, pdata); |
798 | if (ret < 0) { | |
799 | dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); | |
800 | return ret; | |
5928f538 LD |
801 | } |
802 | ||
803 | config.dev = &client->dev; | |
c2ffa973 | 804 | config.init_data = pdata->reg_init_data; |
5928f538 LD |
805 | config.driver_data = max; |
806 | config.of_node = client->dev.of_node; | |
807 | config.regmap = max->regmap; | |
808 | ||
809 | /* Register the regulators */ | |
8d581fd0 | 810 | rdev = devm_regulator_register(&client->dev, &max->desc, &config); |
5928f538 LD |
811 | if (IS_ERR(rdev)) { |
812 | ret = PTR_ERR(rdev); | |
813 | dev_err(max->dev, "regulator register failed, err %d\n", ret); | |
814 | return ret; | |
815 | } | |
816 | ||
d2d5437b | 817 | max8973_thermal_init(max); |
5928f538 LD |
818 | return 0; |
819 | } | |
820 | ||
5928f538 | 821 | static const struct i2c_device_id max8973_id[] = { |
0f7d6ece LD |
822 | {.name = "max8973", .driver_data = MAX8973}, |
823 | {.name = "max77621", .driver_data = MAX77621}, | |
5928f538 LD |
824 | {}, |
825 | }; | |
5928f538 LD |
826 | MODULE_DEVICE_TABLE(i2c, max8973_id); |
827 | ||
828 | static struct i2c_driver max8973_i2c_driver = { | |
829 | .driver = { | |
830 | .name = "max8973", | |
0f7d6ece | 831 | .of_match_table = of_max8973_match_tbl, |
5928f538 LD |
832 | }, |
833 | .probe = max8973_probe, | |
5928f538 LD |
834 | .id_table = max8973_id, |
835 | }; | |
836 | ||
837 | static int __init max8973_init(void) | |
838 | { | |
839 | return i2c_add_driver(&max8973_i2c_driver); | |
840 | } | |
841 | subsys_initcall(max8973_init); | |
842 | ||
843 | static void __exit max8973_cleanup(void) | |
844 | { | |
845 | i2c_del_driver(&max8973_i2c_driver); | |
846 | } | |
847 | module_exit(max8973_cleanup); | |
848 | ||
849 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
850 | MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); | |
851 | MODULE_LICENSE("GPL v2"); |