Commit | Line | Data |
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0c570674 LD |
1 | /* |
2 | * tps51632-regulator.c -- TI TPS51632 | |
3 | * | |
4 | * Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless | |
5 | * Controller with serial VID control and DVFS. | |
6 | * | |
7 | * Copyright (c) 2012, NVIDIA Corporation. | |
8 | * | |
9 | * Author: Laxman Dewangan <ldewangan@nvidia.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation version 2. | |
14 | * | |
15 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, | |
16 | * whether express or implied; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
23 | * 02111-1307, USA | |
24 | */ | |
25 | ||
26 | #include <linux/err.h> | |
27 | #include <linux/i2c.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
c51ce403 LD |
31 | #include <linux/of.h> |
32 | #include <linux/of_device.h> | |
0c570674 LD |
33 | #include <linux/platform_device.h> |
34 | #include <linux/regmap.h> | |
35 | #include <linux/regulator/driver.h> | |
36 | #include <linux/regulator/machine.h> | |
c51ce403 | 37 | #include <linux/regulator/of_regulator.h> |
0c570674 LD |
38 | #include <linux/regulator/tps51632-regulator.h> |
39 | #include <linux/slab.h> | |
40 | ||
41 | /* Register definitions */ | |
42 | #define TPS51632_VOLTAGE_SELECT_REG 0x0 | |
43 | #define TPS51632_VOLTAGE_BASE_REG 0x1 | |
44 | #define TPS51632_OFFSET_REG 0x2 | |
45 | #define TPS51632_IMON_REG 0x3 | |
46 | #define TPS51632_VMAX_REG 0x4 | |
47 | #define TPS51632_DVFS_CONTROL_REG 0x5 | |
48 | #define TPS51632_POWER_STATE_REG 0x6 | |
49 | #define TPS51632_SLEW_REGS 0x7 | |
50 | #define TPS51632_FAULT_REG 0x14 | |
51 | ||
52 | #define TPS51632_MAX_REG 0x15 | |
53 | ||
54 | #define TPS51632_VOUT_MASK 0x7F | |
55 | #define TPS51632_VOUT_OFFSET_MASK 0x1F | |
56 | #define TPS51632_VMAX_MASK 0x7F | |
57 | #define TPS51632_VMAX_LOCK 0x80 | |
58 | ||
59 | /* TPS51632_DVFS_CONTROL_REG */ | |
60 | #define TPS51632_DVFS_PWMEN 0x1 | |
61 | #define TPS51632_DVFS_STEP_20 0x2 | |
62 | #define TPS51632_DVFS_VMAX_PG 0x4 | |
63 | #define TPS51632_DVFS_PWMRST 0x8 | |
64 | #define TPS51632_DVFS_OCA_EN 0x10 | |
65 | #define TPS51632_DVFS_FCCM 0x20 | |
66 | ||
67 | /* TPS51632_POWER_STATE_REG */ | |
68 | #define TPS51632_POWER_STATE_MASK 0x03 | |
69 | #define TPS51632_POWER_STATE_MULTI_PHASE_CCM 0x0 | |
70 | #define TPS51632_POWER_STATE_SINGLE_PHASE_CCM 0x1 | |
71 | #define TPS51632_POWER_STATE_SINGLE_PHASE_DCM 0x2 | |
72 | ||
73 | #define TPS51632_MIN_VOLATGE 500000 | |
74 | #define TPS51632_MAX_VOLATGE 1520000 | |
75 | #define TPS51632_VOLATGE_STEP_10mV 10000 | |
76 | #define TPS51632_VOLATGE_STEP_20mV 20000 | |
77 | #define TPS51632_MAX_VSEL 0x7F | |
78 | #define TPS51632_MIN_VSEL 0x19 | |
79 | #define TPS51632_DEFAULT_RAMP_DELAY 6000 | |
80 | #define TPS51632_VOLT_VSEL(uV) \ | |
81 | (DIV_ROUND_UP(uV - TPS51632_MIN_VOLATGE, \ | |
82 | TPS51632_VOLATGE_STEP_10mV) + \ | |
83 | TPS51632_MIN_VSEL) | |
84 | ||
85 | /* TPS51632 chip information */ | |
86 | struct tps51632_chip { | |
87 | struct device *dev; | |
88 | struct regulator_desc desc; | |
89 | struct regulator_dev *rdev; | |
90 | struct regmap *regmap; | |
0c570674 LD |
91 | }; |
92 | ||
0c570674 LD |
93 | static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev, |
94 | int ramp_delay) | |
95 | { | |
96 | struct tps51632_chip *tps = rdev_get_drvdata(rdev); | |
97 | int bit = ramp_delay/6000; | |
98 | int ret; | |
99 | ||
100 | if (bit) | |
101 | bit--; | |
102 | ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit)); | |
103 | if (ret < 0) | |
104 | dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | static struct regulator_ops tps51632_dcdc_ops = { | |
d94d9aca AL |
109 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
110 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
0c570674 LD |
111 | .list_voltage = regulator_list_voltage_linear, |
112 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
113 | .set_ramp_delay = tps51632_dcdc_set_ramp_delay, | |
114 | }; | |
115 | ||
a5023574 | 116 | static int tps51632_init_dcdc(struct tps51632_chip *tps, |
0c570674 LD |
117 | struct tps51632_regulator_platform_data *pdata) |
118 | { | |
119 | int ret; | |
120 | uint8_t control = 0; | |
121 | int vsel; | |
122 | ||
123 | if (!pdata->enable_pwm_dvfs) | |
124 | goto skip_pwm_config; | |
125 | ||
126 | control |= TPS51632_DVFS_PWMEN; | |
0c570674 LD |
127 | vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV); |
128 | ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel); | |
129 | if (ret < 0) { | |
130 | dev_err(tps->dev, "BASE reg write failed, err %d\n", ret); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | if (pdata->dvfs_step_20mV) | |
135 | control |= TPS51632_DVFS_STEP_20; | |
136 | ||
137 | if (pdata->max_voltage_uV) { | |
138 | unsigned int vmax; | |
139 | /** | |
140 | * TPS51632 hw behavior: VMAX register can be write only | |
141 | * once as it get locked after first write. The lock get | |
142 | * reset only when device is power-reset. | |
143 | * Write register only when lock bit is not enabled. | |
144 | */ | |
145 | ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax); | |
146 | if (ret < 0) { | |
147 | dev_err(tps->dev, "VMAX read failed, err %d\n", ret); | |
148 | return ret; | |
149 | } | |
150 | if (!(vmax & TPS51632_VMAX_LOCK)) { | |
151 | vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV); | |
152 | ret = regmap_write(tps->regmap, TPS51632_VMAX_REG, | |
153 | vsel); | |
154 | if (ret < 0) { | |
155 | dev_err(tps->dev, | |
156 | "VMAX write failed, err %d\n", ret); | |
157 | return ret; | |
158 | } | |
159 | } | |
160 | } | |
161 | ||
162 | skip_pwm_config: | |
163 | ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control); | |
164 | if (ret < 0) | |
165 | dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret); | |
166 | return ret; | |
167 | } | |
168 | ||
faa3b2d5 | 169 | static bool is_volatile_reg(struct device *dev, unsigned int reg) |
0c570674 | 170 | { |
faa3b2d5 LD |
171 | switch (reg) { |
172 | case TPS51632_OFFSET_REG: | |
173 | case TPS51632_FAULT_REG: | |
174 | case TPS51632_IMON_REG: | |
175 | return true; | |
176 | default: | |
0c570674 | 177 | return false; |
faa3b2d5 LD |
178 | } |
179 | } | |
180 | ||
181 | static bool is_read_reg(struct device *dev, unsigned int reg) | |
182 | { | |
183 | switch (reg) { | |
184 | case 0x08 ... 0x0F: | |
185 | return false; | |
186 | default: | |
187 | return true; | |
188 | } | |
189 | } | |
190 | ||
191 | static bool is_write_reg(struct device *dev, unsigned int reg) | |
192 | { | |
193 | switch (reg) { | |
194 | case TPS51632_VOLTAGE_SELECT_REG: | |
195 | case TPS51632_VOLTAGE_BASE_REG: | |
196 | case TPS51632_VMAX_REG: | |
197 | case TPS51632_DVFS_CONTROL_REG: | |
198 | case TPS51632_POWER_STATE_REG: | |
199 | case TPS51632_SLEW_REGS: | |
200 | return true; | |
201 | default: | |
202 | return false; | |
203 | } | |
0c570674 LD |
204 | } |
205 | ||
206 | static const struct regmap_config tps51632_regmap_config = { | |
207 | .reg_bits = 8, | |
208 | .val_bits = 8, | |
faa3b2d5 LD |
209 | .writeable_reg = is_write_reg, |
210 | .readable_reg = is_read_reg, | |
211 | .volatile_reg = is_volatile_reg, | |
0c570674 LD |
212 | .max_register = TPS51632_MAX_REG - 1, |
213 | .cache_type = REGCACHE_RBTREE, | |
214 | }; | |
215 | ||
c51ce403 LD |
216 | #if defined(CONFIG_OF) |
217 | static const struct of_device_id tps51632_of_match[] = { | |
218 | { .compatible = "ti,tps51632",}, | |
219 | {}, | |
220 | }; | |
221 | MODULE_DEVICE_TABLE(of, tps51632_of_match); | |
222 | ||
223 | static struct tps51632_regulator_platform_data * | |
224 | of_get_tps51632_platform_data(struct device *dev) | |
225 | { | |
226 | struct tps51632_regulator_platform_data *pdata; | |
227 | struct device_node *np = dev->of_node; | |
228 | ||
229 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
230 | if (!pdata) { | |
231 | dev_err(dev, "Memory alloc failed for platform data\n"); | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node); | |
236 | if (!pdata->reg_init_data) { | |
237 | dev_err(dev, "Not able to get OF regulator init data\n"); | |
238 | return NULL; | |
239 | } | |
240 | ||
241 | pdata->enable_pwm_dvfs = | |
242 | of_property_read_bool(np, "ti,enable-pwm-dvfs"); | |
243 | pdata->dvfs_step_20mV = of_property_read_bool(np, "ti,dvfs-step-20mV"); | |
244 | ||
245 | pdata->base_voltage_uV = pdata->reg_init_data->constraints.min_uV ? : | |
246 | TPS51632_MIN_VOLATGE; | |
247 | pdata->max_voltage_uV = pdata->reg_init_data->constraints.max_uV ? : | |
248 | TPS51632_MAX_VOLATGE; | |
249 | return pdata; | |
250 | } | |
251 | #else | |
252 | static struct tps51632_regulator_platform_data * | |
253 | of_get_tps51632_platform_data(struct device *dev) | |
254 | { | |
255 | return NULL; | |
256 | } | |
257 | #endif | |
258 | ||
a5023574 | 259 | static int tps51632_probe(struct i2c_client *client, |
0c570674 LD |
260 | const struct i2c_device_id *id) |
261 | { | |
262 | struct tps51632_regulator_platform_data *pdata; | |
263 | struct regulator_dev *rdev; | |
264 | struct tps51632_chip *tps; | |
265 | int ret; | |
266 | struct regulator_config config = { }; | |
267 | ||
c51ce403 LD |
268 | if (client->dev.of_node) { |
269 | const struct of_device_id *match; | |
270 | match = of_match_device(of_match_ptr(tps51632_of_match), | |
271 | &client->dev); | |
272 | if (!match) { | |
273 | dev_err(&client->dev, "Error: No device match found\n"); | |
274 | return -ENODEV; | |
275 | } | |
276 | } | |
277 | ||
0c570674 | 278 | pdata = client->dev.platform_data; |
c51ce403 LD |
279 | if (!pdata && client->dev.of_node) |
280 | pdata = of_get_tps51632_platform_data(&client->dev); | |
0c570674 LD |
281 | if (!pdata) { |
282 | dev_err(&client->dev, "No Platform data\n"); | |
283 | return -EINVAL; | |
284 | } | |
285 | ||
dbc70518 AL |
286 | if (pdata->enable_pwm_dvfs) { |
287 | if ((pdata->base_voltage_uV < TPS51632_MIN_VOLATGE) || | |
288 | (pdata->base_voltage_uV > TPS51632_MAX_VOLATGE)) { | |
289 | dev_err(&client->dev, "Invalid base_voltage_uV setting\n"); | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | if ((pdata->max_voltage_uV) && | |
294 | ((pdata->max_voltage_uV < TPS51632_MIN_VOLATGE) || | |
295 | (pdata->max_voltage_uV > TPS51632_MAX_VOLATGE))) { | |
296 | dev_err(&client->dev, "Invalid max_voltage_uV setting\n"); | |
297 | return -EINVAL; | |
298 | } | |
299 | } | |
300 | ||
0c570674 LD |
301 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
302 | if (!tps) { | |
303 | dev_err(&client->dev, "Memory allocation failed\n"); | |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | tps->dev = &client->dev; | |
308 | tps->desc.name = id->name; | |
309 | tps->desc.id = 0; | |
310 | tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY; | |
311 | tps->desc.min_uV = TPS51632_MIN_VOLATGE; | |
312 | tps->desc.uV_step = TPS51632_VOLATGE_STEP_10mV; | |
bd0ec7c1 AL |
313 | tps->desc.linear_min_sel = TPS51632_MIN_VSEL; |
314 | tps->desc.n_voltages = TPS51632_MAX_VSEL + 1; | |
0c570674 LD |
315 | tps->desc.ops = &tps51632_dcdc_ops; |
316 | tps->desc.type = REGULATOR_VOLTAGE; | |
317 | tps->desc.owner = THIS_MODULE; | |
318 | ||
d94d9aca AL |
319 | if (pdata->enable_pwm_dvfs) |
320 | tps->desc.vsel_reg = TPS51632_VOLTAGE_BASE_REG; | |
321 | else | |
322 | tps->desc.vsel_reg = TPS51632_VOLTAGE_SELECT_REG; | |
323 | tps->desc.vsel_mask = TPS51632_VOUT_MASK; | |
324 | ||
0c570674 LD |
325 | tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config); |
326 | if (IS_ERR(tps->regmap)) { | |
327 | ret = PTR_ERR(tps->regmap); | |
328 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); | |
329 | return ret; | |
330 | } | |
331 | i2c_set_clientdata(client, tps); | |
332 | ||
333 | ret = tps51632_init_dcdc(tps, pdata); | |
334 | if (ret < 0) { | |
335 | dev_err(tps->dev, "Init failed, err = %d\n", ret); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | /* Register the regulators */ | |
340 | config.dev = &client->dev; | |
341 | config.init_data = pdata->reg_init_data; | |
342 | config.driver_data = tps; | |
343 | config.regmap = tps->regmap; | |
344 | config.of_node = client->dev.of_node; | |
345 | ||
346 | rdev = regulator_register(&tps->desc, &config); | |
347 | if (IS_ERR(rdev)) { | |
348 | dev_err(tps->dev, "regulator register failed\n"); | |
349 | return PTR_ERR(rdev); | |
350 | } | |
351 | ||
352 | tps->rdev = rdev; | |
353 | return 0; | |
354 | } | |
355 | ||
8dc995f5 | 356 | static int tps51632_remove(struct i2c_client *client) |
0c570674 LD |
357 | { |
358 | struct tps51632_chip *tps = i2c_get_clientdata(client); | |
359 | ||
360 | regulator_unregister(tps->rdev); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static const struct i2c_device_id tps51632_id[] = { | |
365 | {.name = "tps51632",}, | |
366 | {}, | |
367 | }; | |
368 | ||
369 | MODULE_DEVICE_TABLE(i2c, tps51632_id); | |
370 | ||
371 | static struct i2c_driver tps51632_i2c_driver = { | |
372 | .driver = { | |
373 | .name = "tps51632", | |
374 | .owner = THIS_MODULE, | |
c51ce403 | 375 | .of_match_table = of_match_ptr(tps51632_of_match), |
0c570674 LD |
376 | }, |
377 | .probe = tps51632_probe, | |
5eb9f2b9 | 378 | .remove = tps51632_remove, |
0c570674 LD |
379 | .id_table = tps51632_id, |
380 | }; | |
381 | ||
382 | static int __init tps51632_init(void) | |
383 | { | |
384 | return i2c_add_driver(&tps51632_i2c_driver); | |
385 | } | |
386 | subsys_initcall(tps51632_init); | |
387 | ||
388 | static void __exit tps51632_cleanup(void) | |
389 | { | |
390 | i2c_del_driver(&tps51632_i2c_driver); | |
391 | } | |
392 | module_exit(tps51632_cleanup); | |
393 | ||
394 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
395 | MODULE_DESCRIPTION("TPS51632 voltage regulator driver"); | |
396 | MODULE_LICENSE("GPL v2"); |