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49d8c599 YZ |
1 | /* |
2 | * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver. | |
3 | * | |
4 | * Supported Part Numbers: | |
5 | * FAN53555UC00X/01X/03X/04X/05X | |
6 | * | |
7 | * Copyright (c) 2012 Marvell Technology Ltd. | |
8 | * Yunfan Zhang <yfzhang@marvell.com> | |
9 | * | |
10 | * This package is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | */ | |
15 | #include <linux/module.h> | |
16 | #include <linux/param.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/regulator/driver.h> | |
20 | #include <linux/regulator/machine.h> | |
91f23d8f HS |
21 | #include <linux/regulator/of_regulator.h> |
22 | #include <linux/of_device.h> | |
49d8c599 YZ |
23 | #include <linux/i2c.h> |
24 | #include <linux/slab.h> | |
25 | #include <linux/regmap.h> | |
26 | #include <linux/regulator/fan53555.h> | |
27 | ||
28 | /* Voltage setting */ | |
29 | #define FAN53555_VSEL0 0x00 | |
30 | #define FAN53555_VSEL1 0x01 | |
31 | /* Control register */ | |
32 | #define FAN53555_CONTROL 0x02 | |
33 | /* IC Type */ | |
34 | #define FAN53555_ID1 0x03 | |
35 | /* IC mask version */ | |
36 | #define FAN53555_ID2 0x04 | |
37 | /* Monitor register */ | |
38 | #define FAN53555_MONITOR 0x05 | |
39 | ||
40 | /* VSEL bit definitions */ | |
41 | #define VSEL_BUCK_EN (1 << 7) | |
42 | #define VSEL_MODE (1 << 6) | |
43 | #define VSEL_NSEL_MASK 0x3F | |
44 | /* Chip ID and Verison */ | |
45 | #define DIE_ID 0x0F /* ID1 */ | |
46 | #define DIE_REV 0x0F /* ID2 */ | |
47 | /* Control bit definitions */ | |
48 | #define CTL_OUTPUT_DISCHG (1 << 7) | |
49 | #define CTL_SLEW_MASK (0x7 << 4) | |
50 | #define CTL_SLEW_SHIFT 4 | |
51 | #define CTL_RESET (1 << 2) | |
52 | ||
53 | #define FAN53555_NVOLTAGES 64 /* Numbers of voltages */ | |
54 | ||
ee30928a HS |
55 | enum fan53555_vendor { |
56 | FAN53555_VENDOR_FAIRCHILD = 0, | |
57 | FAN53555_VENDOR_SILERGY, | |
58 | }; | |
59 | ||
49d8c599 YZ |
60 | /* IC Type */ |
61 | enum { | |
62 | FAN53555_CHIP_ID_00 = 0, | |
63 | FAN53555_CHIP_ID_01, | |
64 | FAN53555_CHIP_ID_02, | |
65 | FAN53555_CHIP_ID_03, | |
66 | FAN53555_CHIP_ID_04, | |
67 | FAN53555_CHIP_ID_05, | |
68 | }; | |
69 | ||
ee30928a HS |
70 | enum { |
71 | SILERGY_SYR82X = 8, | |
72 | }; | |
73 | ||
49d8c599 | 74 | struct fan53555_device_info { |
ee30928a | 75 | enum fan53555_vendor vendor; |
49d8c599 YZ |
76 | struct regmap *regmap; |
77 | struct device *dev; | |
78 | struct regulator_desc desc; | |
79 | struct regulator_dev *rdev; | |
80 | struct regulator_init_data *regulator; | |
81 | /* IC Type and Rev */ | |
82 | int chip_id; | |
83 | int chip_rev; | |
84 | /* Voltage setting register */ | |
85 | unsigned int vol_reg; | |
86 | unsigned int sleep_reg; | |
87 | /* Voltage range and step(linear) */ | |
88 | unsigned int vsel_min; | |
49d8c599 YZ |
89 | unsigned int vsel_step; |
90 | /* Voltage slew rate limiting */ | |
91 | unsigned int slew_rate; | |
92 | /* Sleep voltage cache */ | |
93 | unsigned int sleep_vol_cache; | |
94 | }; | |
95 | ||
96 | static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV) | |
97 | { | |
98 | struct fan53555_device_info *di = rdev_get_drvdata(rdev); | |
99 | int ret; | |
100 | ||
101 | if (di->sleep_vol_cache == uV) | |
102 | return 0; | |
103 | ret = regulator_map_voltage_linear(rdev, uV, uV); | |
104 | if (ret < 0) | |
145fe1e1 | 105 | return ret; |
49d8c599 YZ |
106 | ret = regmap_update_bits(di->regmap, di->sleep_reg, |
107 | VSEL_NSEL_MASK, ret); | |
108 | if (ret < 0) | |
145fe1e1 | 109 | return ret; |
49d8c599 YZ |
110 | /* Cache the sleep voltage setting. |
111 | * Might not be the real voltage which is rounded */ | |
112 | di->sleep_vol_cache = uV; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
118 | { | |
119 | struct fan53555_device_info *di = rdev_get_drvdata(rdev); | |
120 | ||
121 | switch (mode) { | |
122 | case REGULATOR_MODE_FAST: | |
123 | regmap_update_bits(di->regmap, di->vol_reg, | |
124 | VSEL_MODE, VSEL_MODE); | |
125 | break; | |
126 | case REGULATOR_MODE_NORMAL: | |
127 | regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0); | |
128 | break; | |
129 | default: | |
130 | return -EINVAL; | |
131 | } | |
132 | return 0; | |
133 | } | |
134 | ||
135 | static unsigned int fan53555_get_mode(struct regulator_dev *rdev) | |
136 | { | |
137 | struct fan53555_device_info *di = rdev_get_drvdata(rdev); | |
138 | unsigned int val; | |
139 | int ret = 0; | |
140 | ||
141 | ret = regmap_read(di->regmap, di->vol_reg, &val); | |
142 | if (ret < 0) | |
143 | return ret; | |
144 | if (val & VSEL_MODE) | |
145 | return REGULATOR_MODE_FAST; | |
146 | else | |
147 | return REGULATOR_MODE_NORMAL; | |
148 | } | |
149 | ||
dd7e71fb HS |
150 | static int slew_rates[] = { |
151 | 64000, | |
152 | 32000, | |
153 | 16000, | |
154 | 8000, | |
155 | 4000, | |
156 | 2000, | |
157 | 1000, | |
158 | 500, | |
159 | }; | |
160 | ||
161 | static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp) | |
162 | { | |
163 | struct fan53555_device_info *di = rdev_get_drvdata(rdev); | |
164 | int regval = -1, i; | |
165 | ||
166 | for (i = 0; i < ARRAY_SIZE(slew_rates); i++) { | |
167 | if (ramp <= slew_rates[i]) | |
168 | regval = i; | |
169 | else | |
170 | break; | |
171 | } | |
172 | ||
173 | if (regval < 0) { | |
174 | dev_err(di->dev, "unsupported ramp value %d\n", ramp); | |
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | return regmap_update_bits(di->regmap, FAN53555_CONTROL, | |
179 | CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT); | |
180 | } | |
181 | ||
49d8c599 YZ |
182 | static struct regulator_ops fan53555_regulator_ops = { |
183 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
184 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
185 | .map_voltage = regulator_map_voltage_linear, | |
186 | .list_voltage = regulator_list_voltage_linear, | |
187 | .set_suspend_voltage = fan53555_set_suspend_voltage, | |
188 | .enable = regulator_enable_regmap, | |
189 | .disable = regulator_disable_regmap, | |
190 | .is_enabled = regulator_is_enabled_regmap, | |
191 | .set_mode = fan53555_set_mode, | |
192 | .get_mode = fan53555_get_mode, | |
dd7e71fb | 193 | .set_ramp_delay = fan53555_set_ramp, |
49d8c599 YZ |
194 | }; |
195 | ||
ee30928a HS |
196 | static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di) |
197 | { | |
198 | /* Init voltage range and step */ | |
199 | switch (di->chip_id) { | |
200 | case FAN53555_CHIP_ID_00: | |
201 | case FAN53555_CHIP_ID_01: | |
202 | case FAN53555_CHIP_ID_03: | |
203 | case FAN53555_CHIP_ID_05: | |
204 | di->vsel_min = 600000; | |
205 | di->vsel_step = 10000; | |
206 | break; | |
207 | case FAN53555_CHIP_ID_04: | |
208 | di->vsel_min = 603000; | |
209 | di->vsel_step = 12826; | |
210 | break; | |
211 | default: | |
212 | dev_err(di->dev, | |
213 | "Chip ID %d not supported!\n", di->chip_id); | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di) | |
221 | { | |
222 | /* Init voltage range and step */ | |
223 | switch (di->chip_id) { | |
224 | case SILERGY_SYR82X: | |
225 | di->vsel_min = 712500; | |
226 | di->vsel_step = 12500; | |
227 | break; | |
228 | default: | |
229 | dev_err(di->dev, | |
230 | "Chip ID %d not supported!\n", di->chip_id); | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
49d8c599 YZ |
237 | /* For 00,01,03,05 options: |
238 | * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V. | |
239 | * For 04 option: | |
240 | * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V. | |
241 | * */ | |
242 | static int fan53555_device_setup(struct fan53555_device_info *di, | |
243 | struct fan53555_platform_data *pdata) | |
244 | { | |
ee30928a HS |
245 | int ret = 0; |
246 | ||
49d8c599 YZ |
247 | /* Setup voltage control register */ |
248 | switch (pdata->sleep_vsel_id) { | |
249 | case FAN53555_VSEL_ID_0: | |
250 | di->sleep_reg = FAN53555_VSEL0; | |
251 | di->vol_reg = FAN53555_VSEL1; | |
252 | break; | |
253 | case FAN53555_VSEL_ID_1: | |
254 | di->sleep_reg = FAN53555_VSEL1; | |
255 | di->vol_reg = FAN53555_VSEL0; | |
256 | break; | |
257 | default: | |
258 | dev_err(di->dev, "Invalid VSEL ID!\n"); | |
259 | return -EINVAL; | |
260 | } | |
ee30928a HS |
261 | |
262 | switch (di->vendor) { | |
263 | case FAN53555_VENDOR_FAIRCHILD: | |
264 | ret = fan53555_voltages_setup_fairchild(di); | |
49d8c599 | 265 | break; |
ee30928a HS |
266 | case FAN53555_VENDOR_SILERGY: |
267 | ret = fan53555_voltages_setup_silergy(di); | |
49d8c599 YZ |
268 | break; |
269 | default: | |
fe230531 | 270 | dev_err(di->dev, "vendor %d not supported!\n", di->vendor); |
49d8c599 YZ |
271 | return -EINVAL; |
272 | } | |
dd7e71fb | 273 | |
ee30928a | 274 | return ret; |
49d8c599 YZ |
275 | } |
276 | ||
277 | static int fan53555_regulator_register(struct fan53555_device_info *di, | |
278 | struct regulator_config *config) | |
279 | { | |
280 | struct regulator_desc *rdesc = &di->desc; | |
281 | ||
282 | rdesc->name = "fan53555-reg"; | |
3415d601 | 283 | rdesc->supply_name = "vin"; |
49d8c599 YZ |
284 | rdesc->ops = &fan53555_regulator_ops; |
285 | rdesc->type = REGULATOR_VOLTAGE; | |
286 | rdesc->n_voltages = FAN53555_NVOLTAGES; | |
287 | rdesc->enable_reg = di->vol_reg; | |
288 | rdesc->enable_mask = VSEL_BUCK_EN; | |
289 | rdesc->min_uV = di->vsel_min; | |
290 | rdesc->uV_step = di->vsel_step; | |
291 | rdesc->vsel_reg = di->vol_reg; | |
292 | rdesc->vsel_mask = VSEL_NSEL_MASK; | |
293 | rdesc->owner = THIS_MODULE; | |
294 | ||
b15f5f76 | 295 | di->rdev = devm_regulator_register(di->dev, &di->desc, config); |
8c6ffba0 | 296 | return PTR_ERR_OR_ZERO(di->rdev); |
49d8c599 YZ |
297 | } |
298 | ||
299 | static struct regmap_config fan53555_regmap_config = { | |
300 | .reg_bits = 8, | |
301 | .val_bits = 8, | |
302 | }; | |
303 | ||
91f23d8f | 304 | static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev, |
072e78b1 JMC |
305 | struct device_node *np, |
306 | const struct regulator_desc *desc) | |
91f23d8f HS |
307 | { |
308 | struct fan53555_platform_data *pdata; | |
309 | int ret; | |
310 | u32 tmp; | |
311 | ||
312 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
313 | if (!pdata) | |
314 | return NULL; | |
315 | ||
072e78b1 | 316 | pdata->regulator = of_get_regulator_init_data(dev, np, desc); |
91f23d8f HS |
317 | |
318 | ret = of_property_read_u32(np, "fcs,suspend-voltage-selector", | |
319 | &tmp); | |
320 | if (!ret) | |
321 | pdata->sleep_vsel_id = tmp; | |
322 | ||
323 | return pdata; | |
324 | } | |
325 | ||
326 | static const struct of_device_id fan53555_dt_ids[] = { | |
327 | { | |
328 | .compatible = "fcs,fan53555", | |
ee30928a HS |
329 | .data = (void *)FAN53555_VENDOR_FAIRCHILD |
330 | }, { | |
331 | .compatible = "silergy,syr827", | |
332 | .data = (void *)FAN53555_VENDOR_SILERGY, | |
333 | }, { | |
334 | .compatible = "silergy,syr828", | |
335 | .data = (void *)FAN53555_VENDOR_SILERGY, | |
91f23d8f HS |
336 | }, |
337 | { } | |
338 | }; | |
339 | MODULE_DEVICE_TABLE(of, fan53555_dt_ids); | |
340 | ||
a5023574 | 341 | static int fan53555_regulator_probe(struct i2c_client *client, |
49d8c599 YZ |
342 | const struct i2c_device_id *id) |
343 | { | |
91f23d8f | 344 | struct device_node *np = client->dev.of_node; |
49d8c599 YZ |
345 | struct fan53555_device_info *di; |
346 | struct fan53555_platform_data *pdata; | |
347 | struct regulator_config config = { }; | |
348 | unsigned int val; | |
349 | int ret; | |
350 | ||
072e78b1 JMC |
351 | di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info), |
352 | GFP_KERNEL); | |
353 | if (!di) | |
354 | return -ENOMEM; | |
355 | ||
dff91d0b | 356 | pdata = dev_get_platdata(&client->dev); |
91f23d8f | 357 | if (!pdata) |
072e78b1 | 358 | pdata = fan53555_parse_dt(&client->dev, np, &di->desc); |
91f23d8f | 359 | |
49d8c599 YZ |
360 | if (!pdata || !pdata->regulator) { |
361 | dev_err(&client->dev, "Platform data not found!\n"); | |
362 | return -ENODEV; | |
363 | } | |
364 | ||
e13426bf | 365 | di->regulator = pdata->regulator; |
ee30928a HS |
366 | if (client->dev.of_node) { |
367 | const struct of_device_id *match; | |
368 | ||
369 | match = of_match_device(of_match_ptr(fan53555_dt_ids), | |
370 | &client->dev); | |
371 | if (!match) | |
372 | return -ENODEV; | |
373 | ||
6f34163c | 374 | di->vendor = (unsigned long) match->data; |
ee30928a | 375 | } else { |
91f23d8f HS |
376 | /* if no ramp constraint set, get the pdata ramp_delay */ |
377 | if (!di->regulator->constraints.ramp_delay) { | |
378 | int slew_idx = (pdata->slew_rate & 0x7) | |
379 | ? pdata->slew_rate : 0; | |
dd7e71fb | 380 | |
91f23d8f HS |
381 | di->regulator->constraints.ramp_delay |
382 | = slew_rates[slew_idx]; | |
383 | } | |
ee30928a HS |
384 | |
385 | di->vendor = id->driver_data; | |
dd7e71fb HS |
386 | } |
387 | ||
49d8c599 YZ |
388 | di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config); |
389 | if (IS_ERR(di->regmap)) { | |
390 | dev_err(&client->dev, "Failed to allocate regmap!\n"); | |
391 | return PTR_ERR(di->regmap); | |
392 | } | |
393 | di->dev = &client->dev; | |
49d8c599 YZ |
394 | i2c_set_clientdata(client, di); |
395 | /* Get chip ID */ | |
396 | ret = regmap_read(di->regmap, FAN53555_ID1, &val); | |
397 | if (ret < 0) { | |
398 | dev_err(&client->dev, "Failed to get chip ID!\n"); | |
145fe1e1 | 399 | return ret; |
49d8c599 YZ |
400 | } |
401 | di->chip_id = val & DIE_ID; | |
402 | /* Get chip revision */ | |
403 | ret = regmap_read(di->regmap, FAN53555_ID2, &val); | |
404 | if (ret < 0) { | |
405 | dev_err(&client->dev, "Failed to get chip Rev!\n"); | |
145fe1e1 | 406 | return ret; |
49d8c599 YZ |
407 | } |
408 | di->chip_rev = val & DIE_REV; | |
409 | dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n", | |
410 | di->chip_id, di->chip_rev); | |
411 | /* Device init */ | |
412 | ret = fan53555_device_setup(di, pdata); | |
413 | if (ret < 0) { | |
414 | dev_err(&client->dev, "Failed to setup device!\n"); | |
415 | return ret; | |
416 | } | |
417 | /* Register regulator */ | |
418 | config.dev = di->dev; | |
419 | config.init_data = di->regulator; | |
420 | config.regmap = di->regmap; | |
421 | config.driver_data = di; | |
91f23d8f HS |
422 | config.of_node = np; |
423 | ||
49d8c599 YZ |
424 | ret = fan53555_regulator_register(di, &config); |
425 | if (ret < 0) | |
426 | dev_err(&client->dev, "Failed to register regulator!\n"); | |
427 | return ret; | |
428 | ||
429 | } | |
430 | ||
49d8c599 | 431 | static const struct i2c_device_id fan53555_id[] = { |
ee30928a HS |
432 | { |
433 | .name = "fan53555", | |
434 | .driver_data = FAN53555_VENDOR_FAIRCHILD | |
435 | }, { | |
436 | .name = "syr82x", | |
437 | .driver_data = FAN53555_VENDOR_SILERGY | |
438 | }, | |
49d8c599 YZ |
439 | { }, |
440 | }; | |
441 | ||
442 | static struct i2c_driver fan53555_regulator_driver = { | |
443 | .driver = { | |
444 | .name = "fan53555-regulator", | |
91f23d8f | 445 | .of_match_table = of_match_ptr(fan53555_dt_ids), |
49d8c599 YZ |
446 | }, |
447 | .probe = fan53555_regulator_probe, | |
49d8c599 YZ |
448 | .id_table = fan53555_id, |
449 | }; | |
450 | ||
451 | module_i2c_driver(fan53555_regulator_driver); | |
452 | ||
453 | MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>"); | |
454 | MODULE_DESCRIPTION("FAN53555 regulator driver"); | |
455 | MODULE_LICENSE("GPL v2"); |