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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> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/regmap.h> | |
33 | #include <linux/regulator/driver.h> | |
34 | #include <linux/regulator/machine.h> | |
35 | #include <linux/regulator/tps51632-regulator.h> | |
36 | #include <linux/slab.h> | |
37 | ||
38 | /* Register definitions */ | |
39 | #define TPS51632_VOLTAGE_SELECT_REG 0x0 | |
40 | #define TPS51632_VOLTAGE_BASE_REG 0x1 | |
41 | #define TPS51632_OFFSET_REG 0x2 | |
42 | #define TPS51632_IMON_REG 0x3 | |
43 | #define TPS51632_VMAX_REG 0x4 | |
44 | #define TPS51632_DVFS_CONTROL_REG 0x5 | |
45 | #define TPS51632_POWER_STATE_REG 0x6 | |
46 | #define TPS51632_SLEW_REGS 0x7 | |
47 | #define TPS51632_FAULT_REG 0x14 | |
48 | ||
49 | #define TPS51632_MAX_REG 0x15 | |
50 | ||
51 | #define TPS51632_VOUT_MASK 0x7F | |
52 | #define TPS51632_VOUT_OFFSET_MASK 0x1F | |
53 | #define TPS51632_VMAX_MASK 0x7F | |
54 | #define TPS51632_VMAX_LOCK 0x80 | |
55 | ||
56 | /* TPS51632_DVFS_CONTROL_REG */ | |
57 | #define TPS51632_DVFS_PWMEN 0x1 | |
58 | #define TPS51632_DVFS_STEP_20 0x2 | |
59 | #define TPS51632_DVFS_VMAX_PG 0x4 | |
60 | #define TPS51632_DVFS_PWMRST 0x8 | |
61 | #define TPS51632_DVFS_OCA_EN 0x10 | |
62 | #define TPS51632_DVFS_FCCM 0x20 | |
63 | ||
64 | /* TPS51632_POWER_STATE_REG */ | |
65 | #define TPS51632_POWER_STATE_MASK 0x03 | |
66 | #define TPS51632_POWER_STATE_MULTI_PHASE_CCM 0x0 | |
67 | #define TPS51632_POWER_STATE_SINGLE_PHASE_CCM 0x1 | |
68 | #define TPS51632_POWER_STATE_SINGLE_PHASE_DCM 0x2 | |
69 | ||
70 | #define TPS51632_MIN_VOLATGE 500000 | |
71 | #define TPS51632_MAX_VOLATGE 1520000 | |
72 | #define TPS51632_VOLATGE_STEP_10mV 10000 | |
73 | #define TPS51632_VOLATGE_STEP_20mV 20000 | |
74 | #define TPS51632_MAX_VSEL 0x7F | |
75 | #define TPS51632_MIN_VSEL 0x19 | |
76 | #define TPS51632_DEFAULT_RAMP_DELAY 6000 | |
77 | #define TPS51632_VOLT_VSEL(uV) \ | |
78 | (DIV_ROUND_UP(uV - TPS51632_MIN_VOLATGE, \ | |
79 | TPS51632_VOLATGE_STEP_10mV) + \ | |
80 | TPS51632_MIN_VSEL) | |
81 | ||
82 | /* TPS51632 chip information */ | |
83 | struct tps51632_chip { | |
84 | struct device *dev; | |
85 | struct regulator_desc desc; | |
86 | struct regulator_dev *rdev; | |
87 | struct regmap *regmap; | |
88 | bool enable_pwm_dvfs; | |
89 | }; | |
90 | ||
91 | static int tps51632_dcdc_get_voltage_sel(struct regulator_dev *rdev) | |
92 | { | |
93 | struct tps51632_chip *tps = rdev_get_drvdata(rdev); | |
94 | unsigned int data; | |
95 | int ret; | |
96 | unsigned int reg = TPS51632_VOLTAGE_SELECT_REG; | |
97 | int vsel; | |
98 | ||
99 | if (tps->enable_pwm_dvfs) | |
100 | reg = TPS51632_VOLTAGE_BASE_REG; | |
101 | ||
102 | ret = regmap_read(tps->regmap, reg, &data); | |
103 | if (ret < 0) { | |
104 | dev_err(tps->dev, "reg read failed, err %d\n", ret); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | vsel = data & TPS51632_VOUT_MASK; | |
109 | ||
110 | if (vsel < TPS51632_MIN_VSEL) | |
111 | return 0; | |
112 | else | |
113 | return vsel - TPS51632_MIN_VSEL; | |
114 | } | |
115 | ||
116 | static int tps51632_dcdc_set_voltage_sel(struct regulator_dev *rdev, | |
117 | unsigned selector) | |
118 | { | |
119 | struct tps51632_chip *tps = rdev_get_drvdata(rdev); | |
120 | int vsel; | |
121 | int ret; | |
122 | unsigned int reg = TPS51632_VOLTAGE_SELECT_REG; | |
123 | ||
124 | if (tps->enable_pwm_dvfs) | |
125 | reg = TPS51632_VOLTAGE_BASE_REG; | |
126 | ||
127 | vsel = selector + TPS51632_MIN_VSEL; | |
128 | if (vsel > TPS51632_MAX_VSEL) | |
129 | return -EINVAL; | |
130 | ||
131 | ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_SELECT_REG, vsel); | |
132 | if (ret < 0) | |
133 | dev_err(tps->dev, "reg write failed, err %d\n", ret); | |
134 | return ret; | |
135 | } | |
136 | ||
137 | static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev, | |
138 | int ramp_delay) | |
139 | { | |
140 | struct tps51632_chip *tps = rdev_get_drvdata(rdev); | |
141 | int bit = ramp_delay/6000; | |
142 | int ret; | |
143 | ||
144 | if (bit) | |
145 | bit--; | |
146 | ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit)); | |
147 | if (ret < 0) | |
148 | dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret); | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static struct regulator_ops tps51632_dcdc_ops = { | |
153 | .get_voltage_sel = tps51632_dcdc_get_voltage_sel, | |
154 | .set_voltage_sel = tps51632_dcdc_set_voltage_sel, | |
155 | .list_voltage = regulator_list_voltage_linear, | |
156 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
157 | .set_ramp_delay = tps51632_dcdc_set_ramp_delay, | |
158 | }; | |
159 | ||
a5023574 | 160 | static int tps51632_init_dcdc(struct tps51632_chip *tps, |
0c570674 LD |
161 | struct tps51632_regulator_platform_data *pdata) |
162 | { | |
163 | int ret; | |
164 | uint8_t control = 0; | |
165 | int vsel; | |
166 | ||
167 | if (!pdata->enable_pwm_dvfs) | |
168 | goto skip_pwm_config; | |
169 | ||
170 | control |= TPS51632_DVFS_PWMEN; | |
171 | tps->enable_pwm_dvfs = pdata->enable_pwm_dvfs; | |
172 | vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV); | |
173 | ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel); | |
174 | if (ret < 0) { | |
175 | dev_err(tps->dev, "BASE reg write failed, err %d\n", ret); | |
176 | return ret; | |
177 | } | |
178 | ||
179 | if (pdata->dvfs_step_20mV) | |
180 | control |= TPS51632_DVFS_STEP_20; | |
181 | ||
182 | if (pdata->max_voltage_uV) { | |
183 | unsigned int vmax; | |
184 | /** | |
185 | * TPS51632 hw behavior: VMAX register can be write only | |
186 | * once as it get locked after first write. The lock get | |
187 | * reset only when device is power-reset. | |
188 | * Write register only when lock bit is not enabled. | |
189 | */ | |
190 | ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax); | |
191 | if (ret < 0) { | |
192 | dev_err(tps->dev, "VMAX read failed, err %d\n", ret); | |
193 | return ret; | |
194 | } | |
195 | if (!(vmax & TPS51632_VMAX_LOCK)) { | |
196 | vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV); | |
197 | ret = regmap_write(tps->regmap, TPS51632_VMAX_REG, | |
198 | vsel); | |
199 | if (ret < 0) { | |
200 | dev_err(tps->dev, | |
201 | "VMAX write failed, err %d\n", ret); | |
202 | return ret; | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
207 | skip_pwm_config: | |
208 | ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control); | |
209 | if (ret < 0) | |
210 | dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret); | |
211 | return ret; | |
212 | } | |
213 | ||
214 | static bool rd_wr_reg(struct device *dev, unsigned int reg) | |
215 | { | |
216 | if ((reg >= 0x8) && (reg <= 0x10)) | |
217 | return false; | |
218 | return true; | |
219 | } | |
220 | ||
221 | static const struct regmap_config tps51632_regmap_config = { | |
222 | .reg_bits = 8, | |
223 | .val_bits = 8, | |
224 | .writeable_reg = rd_wr_reg, | |
225 | .readable_reg = rd_wr_reg, | |
226 | .max_register = TPS51632_MAX_REG - 1, | |
227 | .cache_type = REGCACHE_RBTREE, | |
228 | }; | |
229 | ||
a5023574 | 230 | static int tps51632_probe(struct i2c_client *client, |
0c570674 LD |
231 | const struct i2c_device_id *id) |
232 | { | |
233 | struct tps51632_regulator_platform_data *pdata; | |
234 | struct regulator_dev *rdev; | |
235 | struct tps51632_chip *tps; | |
236 | int ret; | |
237 | struct regulator_config config = { }; | |
238 | ||
239 | pdata = client->dev.platform_data; | |
240 | if (!pdata) { | |
241 | dev_err(&client->dev, "No Platform data\n"); | |
242 | return -EINVAL; | |
243 | } | |
244 | ||
245 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); | |
246 | if (!tps) { | |
247 | dev_err(&client->dev, "Memory allocation failed\n"); | |
248 | return -ENOMEM; | |
249 | } | |
250 | ||
251 | tps->dev = &client->dev; | |
252 | tps->desc.name = id->name; | |
253 | tps->desc.id = 0; | |
254 | tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY; | |
255 | tps->desc.min_uV = TPS51632_MIN_VOLATGE; | |
256 | tps->desc.uV_step = TPS51632_VOLATGE_STEP_10mV; | |
257 | tps->desc.n_voltages = (TPS51632_MAX_VSEL - TPS51632_MIN_VSEL) + 1; | |
258 | tps->desc.ops = &tps51632_dcdc_ops; | |
259 | tps->desc.type = REGULATOR_VOLTAGE; | |
260 | tps->desc.owner = THIS_MODULE; | |
261 | ||
262 | tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config); | |
263 | if (IS_ERR(tps->regmap)) { | |
264 | ret = PTR_ERR(tps->regmap); | |
265 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); | |
266 | return ret; | |
267 | } | |
268 | i2c_set_clientdata(client, tps); | |
269 | ||
270 | ret = tps51632_init_dcdc(tps, pdata); | |
271 | if (ret < 0) { | |
272 | dev_err(tps->dev, "Init failed, err = %d\n", ret); | |
273 | return ret; | |
274 | } | |
275 | ||
276 | /* Register the regulators */ | |
277 | config.dev = &client->dev; | |
278 | config.init_data = pdata->reg_init_data; | |
279 | config.driver_data = tps; | |
280 | config.regmap = tps->regmap; | |
281 | config.of_node = client->dev.of_node; | |
282 | ||
283 | rdev = regulator_register(&tps->desc, &config); | |
284 | if (IS_ERR(rdev)) { | |
285 | dev_err(tps->dev, "regulator register failed\n"); | |
286 | return PTR_ERR(rdev); | |
287 | } | |
288 | ||
289 | tps->rdev = rdev; | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static int __devexit tps51632_remove(struct i2c_client *client) | |
294 | { | |
295 | struct tps51632_chip *tps = i2c_get_clientdata(client); | |
296 | ||
297 | regulator_unregister(tps->rdev); | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static const struct i2c_device_id tps51632_id[] = { | |
302 | {.name = "tps51632",}, | |
303 | {}, | |
304 | }; | |
305 | ||
306 | MODULE_DEVICE_TABLE(i2c, tps51632_id); | |
307 | ||
308 | static struct i2c_driver tps51632_i2c_driver = { | |
309 | .driver = { | |
310 | .name = "tps51632", | |
311 | .owner = THIS_MODULE, | |
312 | }, | |
313 | .probe = tps51632_probe, | |
5eb9f2b9 | 314 | .remove = tps51632_remove, |
0c570674 LD |
315 | .id_table = tps51632_id, |
316 | }; | |
317 | ||
318 | static int __init tps51632_init(void) | |
319 | { | |
320 | return i2c_add_driver(&tps51632_i2c_driver); | |
321 | } | |
322 | subsys_initcall(tps51632_init); | |
323 | ||
324 | static void __exit tps51632_cleanup(void) | |
325 | { | |
326 | i2c_del_driver(&tps51632_i2c_driver); | |
327 | } | |
328 | module_exit(tps51632_cleanup); | |
329 | ||
330 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
331 | MODULE_DESCRIPTION("TPS51632 voltage regulator driver"); | |
332 | MODULE_LICENSE("GPL v2"); |