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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> |
31 | #include <linux/of.h> |
32 | #include <linux/of_device.h> |
33 | #include <linux/platform_device.h> |
34 | #include <linux/regmap.h> |
35 | #include <linux/regulator/driver.h> |
36 | #include <linux/regulator/machine.h> |
37 | #include <linux/regulator/of_regulator.h> |
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; |
91 | }; |
92 | |
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 = { |
109 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
110 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
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 | |
116 | static int tps51632_init_dcdc(struct tps51632_chip *tps, |
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; |
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 | |
169 | static bool is_volatile_reg(struct device *dev, unsigned int reg) |
170 | { |
171 | switch (reg) { |
172 | case TPS51632_OFFSET_REG: |
173 | case TPS51632_FAULT_REG: |
174 | case TPS51632_IMON_REG: |
175 | return true; |
176 | default: |
177 | return false; |
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 | } |
204 | } |
205 | |
206 | static const struct regmap_config tps51632_regmap_config = { |
207 | .reg_bits = 8, |
208 | .val_bits = 8, |
209 | .writeable_reg = is_write_reg, |
210 | .readable_reg = is_read_reg, |
211 | .volatile_reg = is_volatile_reg, |
212 | .max_register = TPS51632_MAX_REG - 1, |
213 | .cache_type = REGCACHE_RBTREE, |
214 | }; |
215 | |
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 | |
259 | static int tps51632_probe(struct i2c_client *client, |
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 | |
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 | |
278 | pdata = client->dev.platform_data; |
279 | if (!pdata && client->dev.of_node) |
280 | pdata = of_get_tps51632_platform_data(&client->dev); |
281 | if (!pdata) { |
282 | dev_err(&client->dev, "No Platform data\n"); |
283 | return -EINVAL; |
284 | } |
285 | |
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 | |
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; |
313 | tps->desc.linear_min_sel = TPS51632_MIN_VSEL; |
314 | tps->desc.n_voltages = TPS51632_MAX_VSEL + 1; |
315 | tps->desc.ops = &tps51632_dcdc_ops; |
316 | tps->desc.type = REGULATOR_VOLTAGE; |
317 | tps->desc.owner = THIS_MODULE; |
318 | |
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 | |
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 | |
356 | static int tps51632_remove(struct i2c_client *client) |
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, |
375 | .of_match_table = of_match_ptr(tps51632_of_match), |
376 | }, |
377 | .probe = tps51632_probe, |
378 | .remove = tps51632_remove, |
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"); |
397 |
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