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133d4016 JL |
1 | /* |
2 | * max77686.c - Regulator driver for the Maxim 77686 | |
3 | * | |
4 | * Copyright (C) 2012 Samsung Electronics | |
5 | * Chiwoong Byun <woong.byun@smasung.com> | |
6 | * Jonghwa Lee <jonghwa3.lee@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | * This driver is based on max8997.c | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/bug.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/gpio.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/platform_device.h> | |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
4706fcab | 34 | #include <linux/regulator/of_regulator.h> |
133d4016 JL |
35 | #include <linux/mfd/max77686.h> |
36 | #include <linux/mfd/max77686-private.h> | |
37 | ||
38 | #define MAX77686_LDO_MINUV 800000 | |
39 | #define MAX77686_LDO_UVSTEP 50000 | |
40 | #define MAX77686_LDO_LOW_MINUV 800000 | |
41 | #define MAX77686_LDO_LOW_UVSTEP 25000 | |
42 | #define MAX77686_BUCK_MINUV 750000 | |
43 | #define MAX77686_BUCK_UVSTEP 50000 | |
852abad2 YSB |
44 | #define MAX77686_RAMP_DELAY 100000 /* uV/us */ |
45 | #define MAX77686_DVS_RAMP_DELAY 27500 /* uV/us */ | |
133d4016 JL |
46 | #define MAX77686_DVS_MINUV 600000 |
47 | #define MAX77686_DVS_UVSTEP 12500 | |
48 | ||
49 | #define MAX77686_OPMODE_SHIFT 6 | |
50 | #define MAX77686_OPMODE_BUCK234_SHIFT 4 | |
51 | #define MAX77686_OPMODE_MASK 0x3 | |
52 | ||
53 | #define MAX77686_VSEL_MASK 0x3F | |
54 | #define MAX77686_DVS_VSEL_MASK 0xFF | |
55 | ||
56 | #define MAX77686_RAMP_RATE_MASK 0xC0 | |
57 | ||
58 | #define MAX77686_REGULATORS MAX77686_REG_MAX | |
59 | #define MAX77686_LDOS 26 | |
60 | ||
61 | enum max77686_ramp_rate { | |
62 | RAMP_RATE_13P75MV, | |
63 | RAMP_RATE_27P5MV, | |
64 | RAMP_RATE_55MV, | |
65 | RAMP_RATE_NO_CTRL, /* 100mV/us */ | |
66 | }; | |
67 | ||
68 | struct max77686_data { | |
cb44cdea | 69 | struct regulator_dev *rdev[MAX77686_REGULATORS]; |
133d4016 JL |
70 | }; |
71 | ||
f503071b YSB |
72 | static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) |
73 | { | |
74 | unsigned int ramp_value = RAMP_RATE_NO_CTRL; | |
75 | ||
76 | switch (ramp_delay) { | |
77 | case 1 ... 13750: | |
78 | ramp_value = RAMP_RATE_13P75MV; | |
79 | break; | |
80 | case 13751 ... 27500: | |
81 | ramp_value = RAMP_RATE_27P5MV; | |
82 | break; | |
83 | case 27501 ... 55000: | |
84 | ramp_value = RAMP_RATE_55MV; | |
85 | break; | |
86 | case 55001 ... 100000: | |
87 | break; | |
88 | default: | |
89 | pr_warn("%s: ramp_delay: %d not supported, setting 100000\n", | |
90 | rdev->desc->name, ramp_delay); | |
91 | } | |
92 | ||
93 | return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, | |
94 | MAX77686_RAMP_RATE_MASK, ramp_value << 6); | |
95 | } | |
96 | ||
133d4016 JL |
97 | static struct regulator_ops max77686_ops = { |
98 | .list_voltage = regulator_list_voltage_linear, | |
2e3f7f26 | 99 | .map_voltage = regulator_map_voltage_linear, |
133d4016 JL |
100 | .is_enabled = regulator_is_enabled_regmap, |
101 | .enable = regulator_enable_regmap, | |
102 | .disable = regulator_disable_regmap, | |
103 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
104 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
852abad2 | 105 | .set_voltage_time_sel = regulator_set_voltage_time_sel, |
133d4016 JL |
106 | }; |
107 | ||
108 | static struct regulator_ops max77686_buck_dvs_ops = { | |
109 | .list_voltage = regulator_list_voltage_linear, | |
2e3f7f26 | 110 | .map_voltage = regulator_map_voltage_linear, |
133d4016 JL |
111 | .is_enabled = regulator_is_enabled_regmap, |
112 | .enable = regulator_enable_regmap, | |
113 | .disable = regulator_disable_regmap, | |
114 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
115 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
852abad2 | 116 | .set_voltage_time_sel = regulator_set_voltage_time_sel, |
f503071b | 117 | .set_ramp_delay = max77686_set_ramp_delay, |
133d4016 JL |
118 | }; |
119 | ||
120 | #define regulator_desc_ldo(num) { \ | |
121 | .name = "LDO"#num, \ | |
122 | .id = MAX77686_LDO##num, \ | |
123 | .ops = &max77686_ops, \ | |
124 | .type = REGULATOR_VOLTAGE, \ | |
125 | .owner = THIS_MODULE, \ | |
126 | .min_uV = MAX77686_LDO_MINUV, \ | |
127 | .uV_step = MAX77686_LDO_UVSTEP, \ | |
852abad2 | 128 | .ramp_delay = MAX77686_RAMP_DELAY, \ |
133d4016 JL |
129 | .n_voltages = MAX77686_VSEL_MASK + 1, \ |
130 | .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | |
131 | .vsel_mask = MAX77686_VSEL_MASK, \ | |
132 | .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | |
133 | .enable_mask = MAX77686_OPMODE_MASK \ | |
134 | << MAX77686_OPMODE_SHIFT, \ | |
135 | } | |
136 | #define regulator_desc_ldo_low(num) { \ | |
137 | .name = "LDO"#num, \ | |
138 | .id = MAX77686_LDO##num, \ | |
139 | .ops = &max77686_ops, \ | |
140 | .type = REGULATOR_VOLTAGE, \ | |
141 | .owner = THIS_MODULE, \ | |
142 | .min_uV = MAX77686_LDO_LOW_MINUV, \ | |
143 | .uV_step = MAX77686_LDO_LOW_UVSTEP, \ | |
852abad2 | 144 | .ramp_delay = MAX77686_RAMP_DELAY, \ |
133d4016 JL |
145 | .n_voltages = MAX77686_VSEL_MASK + 1, \ |
146 | .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | |
147 | .vsel_mask = MAX77686_VSEL_MASK, \ | |
148 | .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \ | |
149 | .enable_mask = MAX77686_OPMODE_MASK \ | |
150 | << MAX77686_OPMODE_SHIFT, \ | |
151 | } | |
152 | #define regulator_desc_buck(num) { \ | |
153 | .name = "BUCK"#num, \ | |
154 | .id = MAX77686_BUCK##num, \ | |
155 | .ops = &max77686_ops, \ | |
156 | .type = REGULATOR_VOLTAGE, \ | |
157 | .owner = THIS_MODULE, \ | |
158 | .min_uV = MAX77686_BUCK_MINUV, \ | |
159 | .uV_step = MAX77686_BUCK_UVSTEP, \ | |
852abad2 | 160 | .ramp_delay = MAX77686_RAMP_DELAY, \ |
133d4016 JL |
161 | .n_voltages = MAX77686_VSEL_MASK + 1, \ |
162 | .vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \ | |
163 | .vsel_mask = MAX77686_VSEL_MASK, \ | |
164 | .enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \ | |
165 | .enable_mask = MAX77686_OPMODE_MASK, \ | |
166 | } | |
167 | #define regulator_desc_buck1(num) { \ | |
168 | .name = "BUCK"#num, \ | |
169 | .id = MAX77686_BUCK##num, \ | |
170 | .ops = &max77686_ops, \ | |
171 | .type = REGULATOR_VOLTAGE, \ | |
172 | .owner = THIS_MODULE, \ | |
173 | .min_uV = MAX77686_BUCK_MINUV, \ | |
174 | .uV_step = MAX77686_BUCK_UVSTEP, \ | |
852abad2 | 175 | .ramp_delay = MAX77686_RAMP_DELAY, \ |
133d4016 JL |
176 | .n_voltages = MAX77686_VSEL_MASK + 1, \ |
177 | .vsel_reg = MAX77686_REG_BUCK1OUT, \ | |
178 | .vsel_mask = MAX77686_VSEL_MASK, \ | |
179 | .enable_reg = MAX77686_REG_BUCK1CTRL, \ | |
180 | .enable_mask = MAX77686_OPMODE_MASK, \ | |
181 | } | |
182 | #define regulator_desc_buck_dvs(num) { \ | |
183 | .name = "BUCK"#num, \ | |
184 | .id = MAX77686_BUCK##num, \ | |
74adfee5 | 185 | .ops = &max77686_buck_dvs_ops, \ |
133d4016 JL |
186 | .type = REGULATOR_VOLTAGE, \ |
187 | .owner = THIS_MODULE, \ | |
188 | .min_uV = MAX77686_DVS_MINUV, \ | |
189 | .uV_step = MAX77686_DVS_UVSTEP, \ | |
852abad2 | 190 | .ramp_delay = MAX77686_DVS_RAMP_DELAY, \ |
133d4016 JL |
191 | .n_voltages = MAX77686_DVS_VSEL_MASK + 1, \ |
192 | .vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \ | |
193 | .vsel_mask = MAX77686_DVS_VSEL_MASK, \ | |
194 | .enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \ | |
195 | .enable_mask = MAX77686_OPMODE_MASK \ | |
196 | << MAX77686_OPMODE_BUCK234_SHIFT, \ | |
197 | } | |
198 | ||
199 | static struct regulator_desc regulators[] = { | |
200 | regulator_desc_ldo_low(1), | |
201 | regulator_desc_ldo_low(2), | |
202 | regulator_desc_ldo(3), | |
203 | regulator_desc_ldo(4), | |
204 | regulator_desc_ldo(5), | |
205 | regulator_desc_ldo_low(6), | |
206 | regulator_desc_ldo_low(7), | |
207 | regulator_desc_ldo_low(8), | |
208 | regulator_desc_ldo(9), | |
209 | regulator_desc_ldo(10), | |
210 | regulator_desc_ldo(11), | |
211 | regulator_desc_ldo(12), | |
212 | regulator_desc_ldo(13), | |
213 | regulator_desc_ldo(14), | |
214 | regulator_desc_ldo_low(15), | |
215 | regulator_desc_ldo(16), | |
216 | regulator_desc_ldo(17), | |
217 | regulator_desc_ldo(18), | |
218 | regulator_desc_ldo(19), | |
219 | regulator_desc_ldo(20), | |
220 | regulator_desc_ldo(21), | |
221 | regulator_desc_ldo(22), | |
222 | regulator_desc_ldo(23), | |
223 | regulator_desc_ldo(24), | |
224 | regulator_desc_ldo(25), | |
225 | regulator_desc_ldo(26), | |
226 | regulator_desc_buck1(1), | |
227 | regulator_desc_buck_dvs(2), | |
228 | regulator_desc_buck_dvs(3), | |
229 | regulator_desc_buck_dvs(4), | |
230 | regulator_desc_buck(5), | |
231 | regulator_desc_buck(6), | |
232 | regulator_desc_buck(7), | |
233 | regulator_desc_buck(8), | |
234 | regulator_desc_buck(9), | |
235 | }; | |
236 | ||
4706fcab YSB |
237 | #ifdef CONFIG_OF |
238 | static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev, | |
239 | struct max77686_platform_data *pdata) | |
240 | { | |
241 | struct device_node *pmic_np, *regulators_np; | |
242 | struct max77686_regulator_data *rdata; | |
243 | struct of_regulator_match rmatch; | |
244 | unsigned int i; | |
245 | ||
246 | pmic_np = iodev->dev->of_node; | |
247 | regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators"); | |
248 | if (!regulators_np) { | |
249 | dev_err(iodev->dev, "could not find regulators sub-node\n"); | |
250 | return -EINVAL; | |
251 | } | |
252 | ||
253 | pdata->num_regulators = ARRAY_SIZE(regulators); | |
254 | rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) * | |
255 | pdata->num_regulators, GFP_KERNEL); | |
256 | if (!rdata) { | |
257 | dev_err(iodev->dev, | |
258 | "could not allocate memory for regulator data\n"); | |
259 | return -ENOMEM; | |
260 | } | |
261 | ||
262 | for (i = 0; i < pdata->num_regulators; i++) { | |
263 | rmatch.name = regulators[i].name; | |
264 | rmatch.init_data = NULL; | |
d1ef065d | 265 | rmatch.of_node = NULL; |
4706fcab YSB |
266 | of_regulator_match(iodev->dev, regulators_np, &rmatch, 1); |
267 | rdata[i].initdata = rmatch.init_data; | |
2c58e266 | 268 | rdata[i].of_node = rmatch.of_node; |
4706fcab YSB |
269 | } |
270 | ||
271 | pdata->regulators = rdata; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | #else | |
276 | static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev, | |
277 | struct max77686_platform_data *pdata) | |
278 | { | |
279 | return 0; | |
280 | } | |
281 | #endif /* CONFIG_OF */ | |
282 | ||
a5023574 | 283 | static int max77686_pmic_probe(struct platform_device *pdev) |
133d4016 JL |
284 | { |
285 | struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
286 | struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev); | |
133d4016 | 287 | struct max77686_data *max77686; |
cb44cdea | 288 | int i, ret = 0; |
c59d2a6b | 289 | struct regulator_config config = { }; |
133d4016 JL |
290 | |
291 | dev_dbg(&pdev->dev, "%s\n", __func__); | |
292 | ||
4706fcab YSB |
293 | if (!pdata) { |
294 | dev_err(&pdev->dev, "no platform data found for regulator\n"); | |
295 | return -ENODEV; | |
296 | } | |
297 | ||
298 | if (iodev->dev->of_node) { | |
299 | ret = max77686_pmic_dt_parse_pdata(iodev, pdata); | |
300 | if (ret) | |
301 | return ret; | |
302 | } | |
303 | ||
304 | if (pdata->num_regulators != MAX77686_REGULATORS) { | |
ab0d1cbe AL |
305 | dev_err(&pdev->dev, |
306 | "Invalid initial data for regulator's initialiation\n"); | |
307 | return -EINVAL; | |
308 | } | |
309 | ||
133d4016 JL |
310 | max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data), |
311 | GFP_KERNEL); | |
312 | if (!max77686) | |
313 | return -ENOMEM; | |
314 | ||
f503071b YSB |
315 | config.dev = &pdev->dev; |
316 | config.regmap = iodev->regmap; | |
133d4016 JL |
317 | platform_set_drvdata(pdev, max77686); |
318 | ||
ab0d1cbe | 319 | for (i = 0; i < MAX77686_REGULATORS; i++) { |
ab0d1cbe | 320 | config.init_data = pdata->regulators[i].initdata; |
2c58e266 | 321 | config.of_node = pdata->regulators[i].of_node; |
133d4016 | 322 | |
cb44cdea AL |
323 | max77686->rdev[i] = regulator_register(®ulators[i], &config); |
324 | if (IS_ERR(max77686->rdev[i])) { | |
325 | ret = PTR_ERR(max77686->rdev[i]); | |
f503071b | 326 | dev_err(&pdev->dev, |
133d4016 | 327 | "regulator init failed for %d\n", i); |
cb44cdea AL |
328 | max77686->rdev[i] = NULL; |
329 | goto err; | |
133d4016 | 330 | } |
133d4016 | 331 | } |
ab0d1cbe | 332 | |
133d4016 JL |
333 | return 0; |
334 | err: | |
ab0d1cbe | 335 | while (--i >= 0) |
cb44cdea | 336 | regulator_unregister(max77686->rdev[i]); |
133d4016 JL |
337 | return ret; |
338 | } | |
339 | ||
340 | static int __devexit max77686_pmic_remove(struct platform_device *pdev) | |
341 | { | |
342 | struct max77686_data *max77686 = platform_get_drvdata(pdev); | |
133d4016 JL |
343 | int i; |
344 | ||
345 | for (i = 0; i < MAX77686_REGULATORS; i++) | |
cb44cdea | 346 | regulator_unregister(max77686->rdev[i]); |
133d4016 JL |
347 | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static const struct platform_device_id max77686_pmic_id[] = { | |
352 | {"max77686-pmic", 0}, | |
353 | { }, | |
354 | }; | |
355 | MODULE_DEVICE_TABLE(platform, max77686_pmic_id); | |
356 | ||
357 | static struct platform_driver max77686_pmic_driver = { | |
358 | .driver = { | |
359 | .name = "max77686-pmic", | |
360 | .owner = THIS_MODULE, | |
361 | }, | |
362 | .probe = max77686_pmic_probe, | |
5eb9f2b9 | 363 | .remove = max77686_pmic_remove, |
133d4016 JL |
364 | .id_table = max77686_pmic_id, |
365 | }; | |
366 | ||
367 | static int __init max77686_pmic_init(void) | |
368 | { | |
369 | return platform_driver_register(&max77686_pmic_driver); | |
370 | } | |
371 | subsys_initcall(max77686_pmic_init); | |
372 | ||
373 | static void __exit max77686_pmic_cleanup(void) | |
374 | { | |
375 | platform_driver_unregister(&max77686_pmic_driver); | |
376 | } | |
377 | module_exit(max77686_pmic_cleanup); | |
378 | ||
379 | MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver"); | |
380 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); | |
381 | MODULE_LICENSE("GPL"); |