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