1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright (c) 2013 Samsung Electronics Co., Ltd
4// http://www.samsung.com
5
6#include <linux/bug.h>
7#include <linux/err.h>
8#include <linux/gpio.h>
9#include <linux/slab.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/regmap.h>
13#include <linux/platform_device.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/machine.h>
16#include <linux/regulator/of_regulator.h>
17#include <linux/mfd/samsung/core.h>
18#include <linux/mfd/samsung/s2mpa01.h>
19
20#define S2MPA01_REGULATOR_CNT ARRAY_SIZE(regulators)
21
22struct s2mpa01_info {
23 struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
24 int ramp_delay24;
25 int ramp_delay3;
26 int ramp_delay5;
27 int ramp_delay16;
28 int ramp_delay7;
29 int ramp_delay8910;
30};
31
32static int get_ramp_delay(int ramp_delay)
33{
34 unsigned char cnt = 0;
35
36 ramp_delay /= 6250;
37
38 while (true) {
39 ramp_delay = ramp_delay >> 1;
40 if (ramp_delay == 0)
41 break;
42 cnt++;
43 }
44
45 if (cnt > 3)
46 cnt = 3;
47
48 return cnt;
49}
50
51static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
52 unsigned int old_selector,
53 unsigned int new_selector)
54{
55 struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
56 unsigned int ramp_delay = 0;
57 int old_volt, new_volt;
58
59 switch (rdev_get_id(rdev)) {
60 case S2MPA01_BUCK2:
61 case S2MPA01_BUCK4:
62 ramp_delay = s2mpa01->ramp_delay24;
63 break;
64 case S2MPA01_BUCK3:
65 ramp_delay = s2mpa01->ramp_delay3;
66 break;
67 case S2MPA01_BUCK5:
68 ramp_delay = s2mpa01->ramp_delay5;
69 break;
70 case S2MPA01_BUCK1:
71 case S2MPA01_BUCK6:
72 ramp_delay = s2mpa01->ramp_delay16;
73 break;
74 case S2MPA01_BUCK7:
75 ramp_delay = s2mpa01->ramp_delay7;
76 break;
77 case S2MPA01_BUCK8:
78 case S2MPA01_BUCK9:
79 case S2MPA01_BUCK10:
80 ramp_delay = s2mpa01->ramp_delay8910;
81 break;
82 }
83
84 if (ramp_delay == 0)
85 ramp_delay = rdev->desc->ramp_delay;
86
87 old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
88 new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);
89
90 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
91}
92
93static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
94{
95 struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
96 unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
97 unsigned int ramp_enable = 1, enable_shift = 0;
98 int ret;
99
100 switch (rdev_get_id(rdev)) {
101 case S2MPA01_BUCK1:
102 enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
103 if (!ramp_delay) {
104 ramp_enable = 0;
105 break;
106 }
107
108 if (ramp_delay > s2mpa01->ramp_delay16)
109 s2mpa01->ramp_delay16 = ramp_delay;
110 else
111 ramp_delay = s2mpa01->ramp_delay16;
112
113 ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
114 break;
115 case S2MPA01_BUCK2:
116 enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
117 if (!ramp_delay) {
118 ramp_enable = 0;
119 break;
120 }
121
122 if (ramp_delay > s2mpa01->ramp_delay24)
123 s2mpa01->ramp_delay24 = ramp_delay;
124 else
125 ramp_delay = s2mpa01->ramp_delay24;
126
127 ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
128 ramp_reg = S2MPA01_REG_RAMP1;
129 break;
130 case S2MPA01_BUCK3:
131 enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
132 if (!ramp_delay) {
133 ramp_enable = 0;
134 break;
135 }
136
137 s2mpa01->ramp_delay3 = ramp_delay;
138 ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
139 ramp_reg = S2MPA01_REG_RAMP1;
140 break;
141 case S2MPA01_BUCK4:
142 enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
143 if (!ramp_delay) {
144 ramp_enable = 0;
145 break;
146 }
147
148 if (ramp_delay > s2mpa01->ramp_delay24)
149 s2mpa01->ramp_delay24 = ramp_delay;
150 else
151 ramp_delay = s2mpa01->ramp_delay24;
152
153 ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
154 ramp_reg = S2MPA01_REG_RAMP1;
155 break;
156 case S2MPA01_BUCK5:
157 s2mpa01->ramp_delay5 = ramp_delay;
158 ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
159 break;
160 case S2MPA01_BUCK6:
161 if (ramp_delay > s2mpa01->ramp_delay16)
162 s2mpa01->ramp_delay16 = ramp_delay;
163 else
164 ramp_delay = s2mpa01->ramp_delay16;
165
166 ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
167 break;
168 case S2MPA01_BUCK7:
169 s2mpa01->ramp_delay7 = ramp_delay;
170 ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
171 break;
172 case S2MPA01_BUCK8:
173 case S2MPA01_BUCK9:
174 case S2MPA01_BUCK10:
175 if (ramp_delay > s2mpa01->ramp_delay8910)
176 s2mpa01->ramp_delay8910 = ramp_delay;
177 else
178 ramp_delay = s2mpa01->ramp_delay8910;
179
180 ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
181 break;
182 default:
183 return 0;
184 }
185
186 if (!ramp_enable)
187 goto ramp_disable;
188
189 /* Ramp delay can be enabled/disabled only for buck[1234] */
190 if (rdev_get_id(rdev) >= S2MPA01_BUCK1 &&
191 rdev_get_id(rdev) <= S2MPA01_BUCK4) {
192 ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
193 1 << enable_shift, 1 << enable_shift);
194 if (ret) {
195 dev_err(&rdev->dev, "failed to enable ramp rate\n");
196 return ret;
197 }
198 }
199
200 ramp_val = get_ramp_delay(ramp_delay);
201
202 return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
203 ramp_val << ramp_shift);
204
205ramp_disable:
206 return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
207 1 << enable_shift, 0);
208}
209
210static const struct regulator_ops s2mpa01_ldo_ops = {
211 .list_voltage = regulator_list_voltage_linear,
212 .map_voltage = regulator_map_voltage_linear,
213 .is_enabled = regulator_is_enabled_regmap,
214 .enable = regulator_enable_regmap,
215 .disable = regulator_disable_regmap,
216 .get_voltage_sel = regulator_get_voltage_sel_regmap,
217 .set_voltage_sel = regulator_set_voltage_sel_regmap,
218 .set_voltage_time_sel = regulator_set_voltage_time_sel,
219};
220
221static const struct regulator_ops s2mpa01_buck_ops = {
222 .list_voltage = regulator_list_voltage_linear,
223 .map_voltage = regulator_map_voltage_linear,
224 .is_enabled = regulator_is_enabled_regmap,
225 .enable = regulator_enable_regmap,
226 .disable = regulator_disable_regmap,
227 .get_voltage_sel = regulator_get_voltage_sel_regmap,
228 .set_voltage_sel = regulator_set_voltage_sel_regmap,
229 .set_voltage_time_sel = s2mpa01_regulator_set_voltage_time_sel,
230 .set_ramp_delay = s2mpa01_set_ramp_delay,
231};
232
233#define regulator_desc_ldo(num, step) { \
234 .name = "LDO"#num, \
235 .id = S2MPA01_LDO##num, \
236 .ops = &s2mpa01_ldo_ops, \
237 .type = REGULATOR_VOLTAGE, \
238 .owner = THIS_MODULE, \
239 .min_uV = MIN_800_MV, \
240 .uV_step = step, \
241 .n_voltages = S2MPA01_LDO_N_VOLTAGES, \
242 .vsel_reg = S2MPA01_REG_L1CTRL + num - 1, \
243 .vsel_mask = S2MPA01_LDO_VSEL_MASK, \
244 .enable_reg = S2MPA01_REG_L1CTRL + num - 1, \
245 .enable_mask = S2MPA01_ENABLE_MASK \
246}
247
248#define regulator_desc_buck1_4(num) { \
249 .name = "BUCK"#num, \
250 .id = S2MPA01_BUCK##num, \
251 .ops = &s2mpa01_buck_ops, \
252 .type = REGULATOR_VOLTAGE, \
253 .owner = THIS_MODULE, \
254 .min_uV = MIN_600_MV, \
255 .uV_step = STEP_6_25_MV, \
256 .n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
257 .ramp_delay = S2MPA01_RAMP_DELAY, \
258 .vsel_reg = S2MPA01_REG_B1CTRL2 + (num - 1) * 2, \
259 .vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
260 .enable_reg = S2MPA01_REG_B1CTRL1 + (num - 1) * 2, \
261 .enable_mask = S2MPA01_ENABLE_MASK \
262}
263
264#define regulator_desc_buck5 { \
265 .name = "BUCK5", \
266 .id = S2MPA01_BUCK5, \
267 .ops = &s2mpa01_buck_ops, \
268 .type = REGULATOR_VOLTAGE, \
269 .owner = THIS_MODULE, \
270 .min_uV = MIN_800_MV, \
271 .uV_step = STEP_6_25_MV, \
272 .n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
273 .ramp_delay = S2MPA01_RAMP_DELAY, \
274 .vsel_reg = S2MPA01_REG_B5CTRL2, \
275 .vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
276 .enable_reg = S2MPA01_REG_B5CTRL1, \
277 .enable_mask = S2MPA01_ENABLE_MASK \
278}
279
280#define regulator_desc_buck6_10(num, min, step) { \
281 .name = "BUCK"#num, \
282 .id = S2MPA01_BUCK##num, \
283 .ops = &s2mpa01_buck_ops, \
284 .type = REGULATOR_VOLTAGE, \
285 .owner = THIS_MODULE, \
286 .min_uV = min, \
287 .uV_step = step, \
288 .n_voltages = S2MPA01_BUCK_N_VOLTAGES, \
289 .ramp_delay = S2MPA01_RAMP_DELAY, \
290 .vsel_reg = S2MPA01_REG_B6CTRL2 + (num - 6) * 2, \
291 .vsel_mask = S2MPA01_BUCK_VSEL_MASK, \
292 .enable_reg = S2MPA01_REG_B6CTRL1 + (num - 6) * 2, \
293 .enable_mask = S2MPA01_ENABLE_MASK \
294}
295
296static const struct regulator_desc regulators[] = {
297 regulator_desc_ldo(1, STEP_25_MV),
298 regulator_desc_ldo(2, STEP_50_MV),
299 regulator_desc_ldo(3, STEP_50_MV),
300 regulator_desc_ldo(4, STEP_50_MV),
301 regulator_desc_ldo(5, STEP_25_MV),
302 regulator_desc_ldo(6, STEP_25_MV),
303 regulator_desc_ldo(7, STEP_50_MV),
304 regulator_desc_ldo(8, STEP_50_MV),
305 regulator_desc_ldo(9, STEP_50_MV),
306 regulator_desc_ldo(10, STEP_50_MV),
307 regulator_desc_ldo(11, STEP_50_MV),
308 regulator_desc_ldo(12, STEP_50_MV),
309 regulator_desc_ldo(13, STEP_50_MV),
310 regulator_desc_ldo(14, STEP_50_MV),
311 regulator_desc_ldo(15, STEP_50_MV),
312 regulator_desc_ldo(16, STEP_50_MV),
313 regulator_desc_ldo(17, STEP_50_MV),
314 regulator_desc_ldo(18, STEP_50_MV),
315 regulator_desc_ldo(19, STEP_50_MV),
316 regulator_desc_ldo(20, STEP_50_MV),
317 regulator_desc_ldo(21, STEP_50_MV),
318 regulator_desc_ldo(22, STEP_50_MV),
319 regulator_desc_ldo(23, STEP_50_MV),
320 regulator_desc_ldo(24, STEP_50_MV),
321 regulator_desc_ldo(25, STEP_50_MV),
322 regulator_desc_ldo(26, STEP_25_MV),
323 regulator_desc_buck1_4(1),
324 regulator_desc_buck1_4(2),
325 regulator_desc_buck1_4(3),
326 regulator_desc_buck1_4(4),
327 regulator_desc_buck5,
328 regulator_desc_buck6_10(6, MIN_600_MV, STEP_6_25_MV),
329 regulator_desc_buck6_10(7, MIN_600_MV, STEP_6_25_MV),
330 regulator_desc_buck6_10(8, MIN_800_MV, STEP_12_5_MV),
331 regulator_desc_buck6_10(9, MIN_1500_MV, STEP_12_5_MV),
332 regulator_desc_buck6_10(10, MIN_1000_MV, STEP_12_5_MV),
333};
334
335static int s2mpa01_pmic_probe(struct platform_device *pdev)
336{
337 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
338 struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
339 struct device_node *reg_np = NULL;
340 struct regulator_config config = { };
341 struct of_regulator_match *rdata;
342 struct s2mpa01_info *s2mpa01;
343 int i;
344
345 s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
346 if (!s2mpa01)
347 return -ENOMEM;
348
349 rdata = s2mpa01->rdata;
350 for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
351 rdata[i].name = regulators[i].name;
352
353 if (iodev->dev->of_node) {
354 reg_np = of_get_child_by_name(iodev->dev->of_node,
355 "regulators");
356 if (!reg_np) {
357 dev_err(&pdev->dev,
358 "could not find regulators sub-node\n");
359 return -EINVAL;
360 }
361
362 of_regulator_match(&pdev->dev, reg_np, rdata,
363 S2MPA01_REGULATOR_MAX);
364 of_node_put(reg_np);
365 }
366
367 platform_set_drvdata(pdev, s2mpa01);
368
369 config.dev = &pdev->dev;
370 config.regmap = iodev->regmap_pmic;
371 config.driver_data = s2mpa01;
372
373 for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
374 struct regulator_dev *rdev;
375 if (pdata)
376 config.init_data = pdata->regulators[i].initdata;
377 else
378 config.init_data = rdata[i].init_data;
379
380 if (reg_np)
381 config.of_node = rdata[i].of_node;
382
383 rdev = devm_regulator_register(&pdev->dev,
384 &regulators[i], &config);
385 if (IS_ERR(rdev)) {
386 dev_err(&pdev->dev, "regulator init failed for %d\n",
387 i);
388 return PTR_ERR(rdev);
389 }
390 }
391
392 return 0;
393}
394
395static const struct platform_device_id s2mpa01_pmic_id[] = {
396 { "s2mpa01-pmic", 0},
397 { },
398};
399MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);
400
401static struct platform_driver s2mpa01_pmic_driver = {
402 .driver = {
403 .name = "s2mpa01-pmic",
404 },
405 .probe = s2mpa01_pmic_probe,
406 .id_table = s2mpa01_pmic_id,
407};
408
409module_platform_driver(s2mpa01_pmic_driver);
410
411/* Module information */
412MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
413MODULE_AUTHOR("Sachin Kamat <sachin.kamat@samsung.com>");
414MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
415MODULE_LICENSE("GPL");
416